Rulings on Marriage, - * A Muslim apostatised and became Christian in order to get asylum in a foreign country, but he believes that he is still a Muslim

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My brother has claimed asylum in a foreign country in order to do that he had to convert to Christianity, now his wife and her family has stopped talking to him and are insisting that his Nikah is no longer valid as he has changed his religion, but my brother insists that he has only done it to claim refugee status so he can better support his family financially, my brother says that he is still a Muslim and practices Islam. He has a 5 year old daughter and he wants his wife and daughter to be with him and live a normal life. He is very confused and do not know how to convince his wife & her parents believe that he is still a Muslim and his Nikah is still valid. Please help me in the light of Quran and Hadith so I may be able to help my brother and his wife InshaAllah.
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Praise be to Allah.
Allah, may He be exalted, says (interpretation of the meaning):
“Whoever disbelieved in Allah after his belief, except him who is forced thereto and whose heart is at ease with Faith, but such as open their hearts to disbelief, on them is wrath from Allah, and theirs will be a great torment”
[an-Nahl 16:106].
Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said:
This verse is one of those which indicate that the view of Jahm and those who followed him is incorrect, because he regarded everyone who speaks words of kufr as being subject to the warning that is applicable to the disbelievers (eternity in Hell), except him who is forced thereto and whose heart is at ease with faith.
If it is said: But Allah, may He be exalted, says “but such as open their hearts to disbelief”, the response is that this is in harmony with the beginning of the verse, because the one who disbelieves without being forced to has opened his heart to disbelief. Otherwise the beginning of the verse would contradict the end, and if what is meant by the one who disbelieves is the one who opens his heart to it, which means without being forced, then an exception would not be made in the case of the one who is forced only; rather there would have to an exception for the one who is forced and the one who is not forced, if he did not open his heart to it. And if he speaks the words of disbelief willingly, then he has opened his heart to it, and that is disbelief.
This is also indicated by the verse in which Allah, may He be exalted, says (interpretation of the meaning):
“The hypocrites fear lest a Soorah (chapter of the Qur’an) should be revealed about them, showing them what is in their hearts. Say: ‘(Go ahead and) mock! But certainly Allah will bring to light all that you fear.’
If you ask them (about this), they declare: ‘We were only talking idly and joking.’ Say: ‘Was it at Allah, and His Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) and His Messenger (blessings and peace of Allah be upon him) that you were mocking?’
Make no excuse; you have disbelieved after you had believed. If We pardon some of you, We will punish others amongst you because they were Mujrimoon (disbelievers, polytheists, sinners, criminals, etc.)”
[at-Tawbah 9:64-66].
Here Allah states that they had disbelieved after having believed, even though they said: We spoke words of disbelief without believing in that; rather we were just talking idly and joking. And He highlighted the fact that making fun of the revelations of Allah constitutes disbelief, and this can only come from one who has opened his heart to such words, for if there had been any faith in his heart, it would have prevented him from speaking such words.
End quote from Majmoo‘ al-Fataawa(7/220).See alsoas-Saarim al-Maslool(524)
Everyone who clearly speaks words of disbelief deliberately and by his own choice becomes a disbeliever, even if that is for the sake of achieving some worldly aim. Most of the disbelief that occurs among people is of this type. The only one for whom an exception is made is the one who is forced or compelled, subject to the conditions connected to such compulsion.
Al-Qurtubi (may Allah have mercy on him) said:
The scholars are unanimously agreed that if a person is forced or compelled to disbelieve, to the extent that he fears for his life, then there is no sin on him if he disbelieves when his heart is at ease with faith…
End quote fromal-Jaami‘ li Ahkaam al-Qur’an(12/435)
But what is the definition of force or compulsion?
The scholars had various views on the definition of force or compulsion, but in general they all boil down to a genuine threat of killing or loss of limb, or threats of rape to both men and women, and the like.
It says inal-Mawsoo‘ah al-Fiqhiyyah al-Kuwaitiyyah(6/101-102) with regard to the conditions of force or compulsion:
That what he is threatened with should be killing or loss of limb, or even by taking away his strength or faculties whilst leaving him alive, such as taking away his sight or his ability to use his hands or walk, even if his limbs are left intact, or other things that cause distress, which includes threatening both men and women with rape.
As for threats of starvation, that varies, but it is not regarded as force or compulsion until the hunger reaches a level whereby the one who is being compelled fears that he may die as a result… End quote.
With regard to blatantly uttering words of disbelief for the sake of improving one’s financial condition, that definitely does not come under the heading of compulsion.
Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said:
I studied the madhhab and I found that compulsion varies according to what the person is being forced to do or say. Compulsion to utters the word of disbelief is not like compulsion to give a gift and the like. Ahmad stated in more than one place that compulsion cannot be regarded as an excuse for uttering the word of disbelief unless torture, such as beating or typing up, is used. Mere (harsh) words cannot be regarded as an excuse for uttering the word of disbelief.
End quote fromal-Mustadrak ‘ala Majmoo‘ al-Fataawa(5/8). See also:Majmoo‘ al-Fataawa(1/372-373)
Moreover, one of the conditions of compulsion (that may excuse a person for uttering the word of disbelief) is that the one who is compelled should not be able to flee from the one who is compelling him, and whose torture he fears. But if he is able to flee, but does not do so, and he remains in that place until he is forced to leave his religion, then he is not regarded as having been compelled to do so. So how about one who goes himself to the place where he will be tempted to leave his religion?
Allah, may He be exalted, says (interpretation of the meaning):
“Verily! As for those whom the angels take (in death) while they are wronging themselves (as they stayed among the disbelievers even though emigration was obligatory for them), they (angels) say (to them): ‘In what (condition) were you?’ They reply: ‘We were weak and oppressed on earth.’ They (angels) say: ‘Was not the earth of Allah spacious enough for you to emigrate therein?’ Such men will find their abode in Hell - What an evil destination!
Except the weak ones among men, women and children who cannot devise a plan, nor are they able to direct their way.
For these there is hope that Allah will forgive them, and Allah is Ever Oft Pardoning, Oft-Forgiving”
[an-Nisa’ 4:95-97].
Shaykh as-Sa‘di (may Allah have mercy on him) said in hisTafseer(195):
This is a stern warning to those who did not migrate when they was able to, until they died. The angels who seize their souls rebuke them with these harsh words and say: “‘What was the matter with you?’” In other words: what was your situation? How did you make yourself distinct from the polytheists? In fact you increased their numbers and perhaps you supported them against the believers, and you missed out on a lot of righteous deeds, jihad with Allah’s Messenger and being with the Muslims, helping them against their enemies.
“They reply: ‘We were weak and oppressed in the land’” that is, weak, downtrodden and oppressed; we had no means of migrating. But they are not speaking the truth when they say that, because Allah rebuked them and warned them, and Allah does not burden any soul with more than it can bear.
Then an exception is made for those who were genuinely weak and oppressed; hence the angels say to them: “‘Was Allah’s earth not spacious enough for you to migrate to some other place?” This is a question that is asked to establish a fact. In other words it is well established in the minds of everyone that the land of Allah is spacious and whenever a person is in a place where he is not able to practice his religion openly, then he has other places on earth and a way out to a land where he will be able to worship Allah. End quote.
So this person must repent to Allah, may He be exalted, from this grave sin, and he must give up what he is doing. You have to advise him that the blessings of Allah, may He be exalted, cannot be attained by disobeying Him and disbelieving in Him; rather they can only be attained by fearing Him.
Allah, may He be exalted, says (interpretation of the meaning):
“And whosoever fears Allah and keeps his duty to Him, He will make a way for him to get out (from every difficulty).
3. And He will provide him from (sources) he never could imagine. And whosoever puts his trust in Allah, then He will suffice him. Verily, Allah will accomplish his purpose. Indeed Allah has set a measure for all things”
[al-Talaaq 65:2-3]
Shaykh as-Sa‘di (may Allah have mercy on him) said:
Everyone who fears Allah, may He be exalted, and constantly seeks the pleasure of Allah in all his affairs, Allah will reward him in this world and the hereafter. Part of that reward is that He will grant him a way out from every hardship and difficulty. Just as whoever fears Allah, Allah will grant him a way out, whoever does not fear Allah will fall into hardship and difficulty that he cannot save himself from or avoid its consequences.
Tayseer al-Kareem ar-Rahmaan fi Tafseer Kalaam al-Mannaan(p. 1026)
The way to have a happy life is not by having lots of money; rather it is by fearing Allah and putting one’s trust in Him properly, and understanding that no person dies until he has used up all the provision that was decreed for him.
It was narrated that Jaabir ibn ‘Abdullah said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “O people, fear Allah and be moderate in seeking a living, for no soul will die until it has received all its provision, even if it is slow in coming. So fear Allah and be moderate in seeking provision; take that which is permissible and leave that which is forbidden.”
Narrated by Ibn Maajah (2144); classed as saheeh by al-Albaani in SaheehSunan Ibn Maajah(2/207).
Secondly:
With regard to the wife of an apostate with whom her husband consummated the marriage before he apostatised, one of two scenarios must apply:
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The first scenario is that the husband repents before her ‘iddah comes to an end. In that case they may go back to one another, after he repents to Allah, may He be exalted, without a new marriage contract, as was regarded as the more correct view by a number of scholars.
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him) said:
Reviling the religion constitutes apostasy from Islam; similarly, reviling the Qur’an and reviling the Messenger also constitute apostasy from Islam, and disbelief after having believed – we seek refuge with Allah from that. But it does not count as divorce for the wife; rather they should be separated without divorce and it is not a divorce; in fact she becomes prohibited to him, because she is a Muslim and he is a disbeliever. She becomes prohibited to him until he repents; if he repents before her ‘iddah ends, then she may go back to him with no need for anything. In other words, if he repents and turns back to Allah, she may go back to him.
End quote fromFataawa Noor ‘ala ad-Darbby Shaykh Ibn Baaz (p. 140).
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said:
If a man apostatises – Allah forbid – his marriage is annulled, unless he repents and comes back to Islam before the end of the ‘iddah, in which case his marriage remains valid.
End quote fromFataawa Noor ‘ala ad-Darbby Shaykh Ibn ‘Uthaymeen (19/2).
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The second scenario is if he repents after the ‘iddah has ended. The majority are of the view that he cannot take her back; rather he may do that with a new marriage contract.
Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said:
If he apostatised and did not come back to Islam until his wife’s ‘iddah ended, then she is completely divorced from him according to the four imams.
End quote fromMajmoo‘ al-Fataawa(32/190)
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him) said:
If he repents after the ‘iddah is over and he wants to (re)marry her, there is nothing wrong with that, but it should be with a new marriage contract, so as to be on the safe side and avoid a matter concerning which the scholars differed. Otherwise some of the scholars think that she is permissible for him without a new marriage contract, if she chooses him and did not marry anyone else after the ‘iddah ended; rather she remained as she was. But if he does a new marriage contract, that is better so as to avoid going against the view of the majority of scholars, because the majority of scholars say that when her ‘iddah ends, she becomes completely divorced from him, and becomes a stranger to him, and she is not permissible for him except with a new marriage contract. Therefore the best and more prudent option is that he should do a new marriage contract. This applies if her ‘iddah ended before he repented. But he is repented before her ‘iddah ended, then she remains his wife, because the Prophet (blessings and peace of Allah be upon him) approved of the previous marriages of those who became Muslim after their wives had done so, if they became Muslim before their wives’ ‘iddahs ended.
End quote fromFataawa Noor ‘ala ad-Darb(p. 140)
To sum up: Anyone who utters the word of disbelief deliberately and willingly becomes a disbeliever thereby. The only exception from that is one who is compelled or forced; he does not become a disbeliever. The one who speaks the word of disbelief in order to increase his wealth is not compelled.
If the apostate repents from his apostasy when his wife with whom he consummated the marriage was still observing ‘iddah, then he may take her back. But if he repents after the end of her ‘iddah, then to be on the safe side, he may take her back with a new marriage contract.
And Allah knows best.

நபிகள் நாயகம் صلى الله عليه وسلم அவர்களின் சொற்பொழிவுகள்

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நபி ஸல்லல்லாஹு அலைஹி வஸல்லம் அவர்களின் இருபத்தோராவது சொற்பொழிவு
ஹிஜ்ரி எட்டு, ரமளான் மாதத்தில் மக்கா வெற்றி கொள்ளப்பட்ட வெள்ளிக்கிழமையன்று நபிபெருமானார் ஸல்லல்லாஹு அலைஹி வஸல்லம் அவர்கள் நிகழ்த்திய பிரசங்கம் இது.
ரஸூலுல்லாஹி ஸல்லல்லாஹு அலைஹி வஸல்லம் அவர்கள் கஃபத்துல்லாஹ்வின் வாயிலில் எழுந்து நின்று அல்லாஹ்வை புகழ்ந்தபின் (ஹம்தும் ஸலவாத்தும் கூறியபின்) மூன்று தடவை 'அல்லாஹு அக்பர்' என்றார்கள். பின்னர் அவர்கள் பேசியதாவது:
அல்லாஹ்வைத் தவிர வேறு இறைவனில்லை. அவன் தன் வாக்குறுதியை நிறைவேற்றினான்;தன் அடியானுக்கு வெற்றியைத் தந்தான். (எதிரிப்)படைகளைச் சிதற அடித்தவன் அவனே. அறியாமைக் காலத்திலே (வழிதவறிய ஜாஹிலியத்தான காலத்தில்) குலப்பெருமையும், பணப்பெருமையும் பாராட்டப்பட்டு வந்ததை இன்று என் இரண்டு காலடிகளிலும் போட்டு மிதித்து விட்டேன். ஹஜ்ஜுப் பிரயாணிகளுக்குத் தண்ணீர் வினியோகிக்கும் உரிமை, கஃபத்துல்லாஹ்வின் காவலுரிமை ஆகிய இரண்டு உரிமகளை மட்டுமே விட்டு வைத்துள்ளேன். முன்பு அவற்றை நிர்வகித்து வந்தவர்களிடமே இப்போதும் அந்த உரிமைகளை விட்டு வைத்துள்ளேன் என்பதை அறிந்து கொள்ளுங்கள்.
'குரைஷிக்குலத்தவரே! வழிதவறிய(ஜாஹிலியத்தான) காலத்தில் நீங்கள் மதித்து வந்த வீண் கவுரவங்களையும்,குடும்பப் பெருமைகளையும் அல்லாஹ் அழித்தே விட்டான். நீங்கள் யாவருமே ஆதமின் புத்திரர்கள். ஆதம் மண்ணிலிருந்து படைக்கப்பட்டிருக்கிறார் என்பதை நன்கு மனதில் இறுத்துங்கள்.
"மனித இனத்தவரே, உங்களை நாம் ஓர் ஆணிலும் ஓர் பெண்ணிலும் இருந்துதான் படைத்துள்ளோம். நீங்கள் ஒருவரையொருவர் நன்கு அறிந்துகொள்வதற்காகவே உங்களை இனங்களாகவும், குடும்பங்களாகவும் பிரித்து வைத்துள்ளோம்.
உங்களில் பயபக்தியுடன் அல்லாஹ்வுக்கு அஞ்சி நடப்பவர்களே இறைவனிடம் மிகவும் கண்ணியம் பெற்றவர்களாவர்.நிச்சயமாக அவன் யாவும் அறிந்தவன்; எங்கும் நிறைந்தவன்" என்று அல்லாஹ் அறிவித்துல்லானல்லவா?
மது குடிப்பதையும், வட்டி வாங்குவதையும், வட்டி கொடுப்பதையும் அல்லாஹுத்தஆலா இன்றிலிருந்து 'ஹராம்' ஆக்கிவிட்டான்.
தடி அல்லது சவுக்கால் அடித்து, உயிர் வாங்கும் கொலையயொத்த படுகொலைக்கு நஷ்ட ஈடாகக் கொடுக்க வேண்டிய தொகை நூறு பெண் ஒட்டகங்களாகும் (என்று நிர்ணயித்துள்ளேன்). இவற்றில் நாற்பது ஒட்டகங்கள் கர்ப்பமானவையாக இருக்க வேண்டும்.
மக்களே! (குல அடிப்படையில்) இஸ்லாத்தில் உடன்பாடு செய்ய இடமில்லை. ஜாஹிலியத்தான அறியாமைக் காலத்தில் செய்யப்பட்ட அத்தகைய ஒப்பத்தங்களை(க்குல அடிப்படையிலான ஒப்பந்த்தங்களை)இப்போது அமல் செய்ய முடியாது.
ஈமான் கொண்ட அனைவரும் மற்ற யாவருக்கும் எதிராக ஒரு கட்சியாக உள்ளனர். அவர்கள் சார்பாக அவர்களில் மிகவும் கீழான நிலையிலுள்ளவரும் (யாருக்கு வேண்டுமாயினும்)அடைக்கலம் அளிக்கலாம்; அவர்களில் வெகு தொலைவிலுள்ளவர்களும் அவரின் அழைப்புக்குரலுக்கு உடனே இணங்கி நடக்க வேண்டும். (அவர்களிலுள்ள) போர் செய்யும் வீரர்கள், (போர் செய்யாது பலஹீனமான நிலையில்) உட்கார்ந்துள்ள தங்கள் கூட்டத்தினருக்கு (ஏதேனும்) ஒதுக்க வேண்டும்.
ஒரு காஃபிருக்குப் பகரமாக எந்த முஃமினும் கொல்லப்படக் கூடாது. ஒரு காஃபிர் கொலை செய்யப்படின் அதன் ஈட்டுத்தொகை ஒரு முஸ்லிமுடைய உயிருக்கான ஈட்டுத்தொகையில்பாதியாகும். ஜக்காத் வசூலை ஓரிடத்திலிருந்து மற்றொரு இடத்துக்கு அனுப்பக்கூடாது'(அதை வசூலிப்பவர்கள்)தொலைவான இடங்களில் இறங்கவும் கூடாது. ஜக்காத் என்ற ஏழை வரியை ஒவ்வொருவருடைய வீட்டிலும் சென்றே வசூலிக்க வேண்டும்.
(கொல்லப்பட்ட) கணவனின் உயிருக்கு நஷ்ட ஈடாகக் கிடைக்கும் தொகையிலும், அவன் சொத்திலும் அவன் மனைவிக்குப் பங்குண்டு. அதே போன்று (கொல்லப்பட்ட) மனைவியின் உயிருக்கு நஷ்ட ஈடாகக் கிடைக்கும் தொகையிலும், அவள் சொத்திலும் கணவனுக்குப் பங்குண்டு. ஆனால், மனைவி கணவனையோ, கணவன் மனைவியையோ கொல்லாமல் இருந்தால்தான் இந்த பாத்தியதை கொண்டாட முடியும். அப்படிக் கொன்றிருந்தால் ஒருவர் மற்றவர் சொத்திலோ, ஈட்டுத்தொகையிலோஎதுவும் பெற இயலாது. எனினும், ஒருவர் மற்றவரைத் தவறுதலாக - கைப்பிசகாகக் கொன்றிருந்தால் மற்றவரின் சொத்துக்கு வாரீஸ் உரிமை உண்டு; நஷ்ட ஈட்டுத் தொகையில் மட்டும் பங்கு இல்லை.
வெவ்வேறு மதங்களைச் சேர்ந்த இருவர் ஒருவர் சொத்துக்கு ஒருவர் வாரீஸாக முடியாது. தன் தந்தையின் சகோதரியின் (மாமியின்) அல்லது தாயின் சகோதரியின் (சிறிய தாயின்) கணவனுக்கு ஒரு பெண் மனைவியாகக் கூடாது.
அத்தாட்சி காட்டி நிரூபிக்க வேண்டிய பொறுப்பு வாதியுடையது. பிரமாணம் செய்ய வேண்டியவன் பிரதிவாதியாவான். ஒரு பெண் (தன் தகப்பன், கணவன், மகன் போன்ற) உறவின் முறையின்றி, மூன்று நாட்கள் பயணமுள்ள தூரத்தைத் தனியே பிரயாணப்படக் கூடாது. அஸருத் தொழுகைக்குப் பின்னர் (சூரிய அஸ்தமனம் வரை) வேறு எந்தத் தொழுகையும் தொழக்கூடாது. ஈதுல் ஃபித்ரு, ஈதுல் அள்ஹா ஆகிய இரண்டு பெருநாட்களிலும்நோன்பு வைக்கக் கூடாது. (மக்கா)வெற்றிக்குப் பின்னர் (அதை விட்டு) இடம் பெயரத் தேவையில்லை.
குறைஷிக் குலத்தவரே! நான் உங்களை எப்படி நடத்த வேண்டும் என்று நீங்கள் எதிர்பார்க்கிறீர்கள்?
[குறைஷித் தலைவர்கள் சொன்னார்கள்: "நன்மையைத் தான் (எதிர்பார்க்கிறோம்). நீங்கள் ஒரு கண்ணியமான சகோதரர்; கண்ணியமான சகோதரர் ஒருவரின் புத்திரர்" என்று]
நபிபெருமானார் ஸல்லல்லாஹு அலைஹி வஸல்லம், அவர்களை நோக்கி கூறினார்கள்; (அப்படியாயின்) யூஸுஃப் (அலைஹிஸ்ஸலாம்) தங்கள் சகோதரர்களிடம் சொன்ன பதிலையே நானும் உங்களிடம் தெரிவிக்கிறேன்."இந்த நாளில் உங்கள் மீது எந்தக் குற்றச்சாட்டுமில்லை; அல்லாஹ் உங்களை பாதுகாப்பானாக! அவன் கருணையாளர்களிலெல்லாம் மகா கருணையாளன். நீங்கள் போகலாம், உங்களை விடுதலை செய்து விட்டேன். (நூல்கள்: அபூதாவூது, இப்னு மாஜா, மிஷ்காத்)

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ஜக்கு: ஏண்டா மக்கு ஒரு கால் பிளாட்பாரத்திலயும், ஒரு கால் ரோடுலையும் வச்சு நடக்கற?
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மக்கு: நல்லவேளை ஞாபகப் படுத்தினடா ஜக்கு, நான் கூட எங்க நொண்டியாயிட்டேனோன்னு பயந்தே போயிட்டேன்.

Invalid Marriages, - * She ran away from her family’s home and married aChristian; is she entitled to a share of her father’s estate?

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My younger sister ran away from the family home when she was sixteen years old. My parents tried very hard to convince her to come back, but she refused and said that she no longer wanted to be part of this family. There has been very little contact between us and her during the last twenty years. Now my father has died.
1. Is my sister entitled to a share of what my father left behind?
2. Is there anything wrong with her marrying a Christian man and saying that her children are free to choose between Islam and Christianity?.
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Praise be to Allaah.
Firstly:
The factors that determine whether one person inherits from another are three: blood ties (kinship), marriage and wala’ (relationship between a freed slave and his former master). And the impediments to inheritance are three: being a slave, being the murderer of the deceased, and being of different religions. The fact that your sister ran away from the family home does not alter the fact that she is the daughter of your parents. This means that she comes under the heading of kinship by virtue of which she is entitled to inherit from them so long as she has not apostatised from Islam.
The fact that she ran away from the family home does not deprive her of her right to inherit from your father, even if she has stayed away from her parents’ home for a long time. And we do not know of any difference of scholarly opinion concerning that.
Secondly:
Marriage of a Muslim woman to a non-Muslim man is a major sin, and there is scholarly consensus that it is haraam and that the marriage contract is invalid. Allah, may He be exalted, says (interpretation of the meaning):
“And give not (your daughters) in marriage to Al-Mushrikoon till they believe (in Allah Alone) and verily, a believing slave is better than a (free) Mushrik (idolater, etc.), even though he pleases you”
[al-Baqarah 2:221]
“O you who believe! When believing women come to you as emigrants, examine them, Allah knows best as to their Faith, then if you ascertain that they are true believers, send them not back to the disbelievers, they are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them”
[al-Mumtahanah 60:10].
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him) was asked: A man married a Muslim woman then it became apparent that the man was a kaafir. What is the ruling on that?
He replied:
If it is proven that the man mentioned was a kaafir at the time of the marriage contract and the woman was Muslim, then the marriage contract is invalid because it is not permissible, according to the consensus of the Muslims, for a kaafir to marry a Muslim woman, because Allah, may He be glorified, says (interpretation of the meaning):“And give not (your daughters) in marriage to Al-Mushrikoon”[al-Baqarah 2:221]and“then if you ascertain that they are true believers, send them not back to the disbelievers, they are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them”
[al-Mumtahanah 60:10].
End quote fromFataawa Islamiyyah, 3/230
It says in a statement of the Islamic Fiqh Council: Marriage of a kaafir to a Muslim woman is haraam and is not permissible according to scholarly consensus. And there is no doubt concerning that, because of what is implied by shar‘i texts.
End quote fromFataawa Islamiyyah, 3/231
Any Muslim woman who is aware of that (and still does it) deserves to incur sin and deserves to be subjected to the hadd punishment for zina. But if a woman was unaware of this ruling, sin is waived in her case, but it is not permissible for her to remain in that marriage, because it was never valid in the first place.
See also the answer to question no. 8396
Thirdly:
It seems from your question that your sister has not declared any apostasy from Islam, but there remains the issue of her marriage to a non-Muslim and her saying that her children are free to choose between Islam and Christianity. So we say:
1. It seems that her marriage to a Christian man is an invalid, haraam marriage. If she did that regarding it as permissible when she was aware of the prohibition on it, then that constitutes apostasy from Islam, and the apostate cannot inherit from his Muslim relative. If she did not regard it as permissible, then she is a sinner, as mentioned above, but that does not prevent her from inheriting.
2. With regard to her saying that her children are free to choose between Islam and Christianity, that is a false notion and a great evil, because Islam is the true religion and nothing other than it is valid or acceptable from anyone.
It should be noted that one of the things that invalidate one’s being a Muslim and that constitutes apostasy is not regarding as disbelievers the People of the Book and the mushrikeen, or having some doubt as to whether they are disbelievers, or regarding their religion as valid. See the answer to question no. 31807and 6688
What you have to do is advise your sister and explain the seriousness of what she has said, and call her to leave her husband if he does not become Muslim.
To sum up the issue of her inheritance: if she remained Muslim and did not regard as permissible her marriage that she knew was invalid, and she did not regard the religion of the Christians as valid or doubt that they are disbelievers, then she may inherit. Otherwise if she has done any of these things that invalidate her being a Muslim, then you have to advise her and ask her to repent in front of scholars in your country. If she repents, all well and good, otherwise she is an apostate and has no right to inherit from your father.
And Allah knows best.