* Intermarrying among Adam and Eve's children

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Asalam Alaikum?
I have no doubt whatsoever, but these kind a things come to mind. Whem Adam and Eve bore children, I assume their children got married among themselves. Isn’t marryingbetween brothers and sisters haram in the Quran?
Can you recommend a good book(s) on Islamic Law covering every and each aspect of Life? Thankyou very much for the generous work for the sake of Allah.
Thanks.
wa alaikum us-salaam wa-rahmat ullaahi wa-barakaatuh
All Praise be to Allaah.
As long as you are confident in your heart about your belief, no suchinsinuations will hurt you (inshaa' Allaah). If a doubtstrikes a believer or something appears to himas a conflict between different textual sources of Shari'ah, he must believe that indeed for such doubts there are trueanswers and for such apparent conflicts there are solutions even if he doesn’t know it or is unable to find the right answer himself. However, a person should not collect all the doubts in his heart and worry aboutthe complexities and leave aside the learning ofuseful knowledge. This is because it is incumbent upon a Muslim to learn and know things which have been clearly described (Muhkamaat) in Shari'ah so that he may be able to repel the doubts.
Regarding the question you have asked, it is a known fact that legislation differs from one Shari'ah to another, while the principles and beliefs remain the same inall of them. So, making of portraits was allowed in the Shari'ah of Sulayman (peace be upon him) but is prohibited in our Shari'ah. Similarly, makingprostration of salutation was permitted in the Shari'ah of Yusuf (peace be upon him) but is illegalin ours. Also, war booty was prohibited for nations before us but it is completely legal for us. The Qiblah of people before us used to be towards Bayt Al-Maqdis, but for us it is towards Ka'bah. In a similar way, marriage between brothers and sisters was permitted in the Shari'ah of Adam (peace be upon him) as opposed to those that came afterwards. Thefollowing is a clarification on the issue by Haafidh Ibn Katheer, who said:
Allaah allowed Adam (peace be upon him) to marry his daughters to hissons for necessity. Every couple used to have a boyand a girl. Hence, he married the girl of one couple to the boy of another. This is said by Suddi regarding what has been narrated by Abu Maalik and Abu Salih, fromIbn ‘Abbas, by Murrah from Ibn Mas‘ood and by other companions of the Prophet (peace be upon him) that Adam did not have (in his grandchildren) a baby boyunless it was accompanied by a girl, so he married the male of a couple to the female of another, and the female of a couple to the male of another.
/ - - - :-> Transtors: 1.http://free-translation.imtranslator.net/lowres.asp 2.http://translate.google.com/m?twu=1&hl=en&vi=m&sl=auto&tl=en