Dought & clear, - Is it permissible for them to use their father’s money when he does not pray?.

My father, May Allah guide him, does not pray. He does not pray unless
he is in a public place or at work, so he does not become embarrassed
if people notice that he does not pray. But he does not consider
prayers with care. An imam and a congregation from a masjid have
advised him to pray, he prayed for a few weeks then stopped. He used
to pray Friday prayer before, and now he stopped even praying the
jumu'ah prayer.
My question is: Is his money that he spends on us halal or haram?
Does the hadeeth of the prophet, peace be upon him that says: "There
is no flesh that is nourished by haram things, but the Fire will be
more entitled to it." Apply to us, his children, or not?.
Praise be to Allaah.
Firstly:
Not praying is a major sin and cause of doom; in fact it is kufr
according to the more correct of the two scholarly opinions, as has
been explained in the answer to question no. 5208and 2182.
The kufr of the one who does not pray leads to numerous rulings in
life and after death. Meat slaughtered by him is not halaal, it is not
valid for him to be a wali (guardian) or witness in case of marriage,
and if he dies he is not to be washed or the prayer offered for him,
and he cannot be buried with the Muslims.
You should carry on calling him, advising him and reminding him, in
the hope that he may repent and come back to Islam. See the answer to
question no. 47425.
Secondly:
The money that he spends on you is not regarded as haraam or impure,
so long as he earns it in a permissible manner, such as a job or trade
and the like. What is meant by the hadeeth, "Every body that is
nourished on haraam, the Fire is more befitting for it" [narrated by
al-Tabaraani and classed as saheeh by al-Albaani inSaheeh
al-Jaami'(4519)] is wealth that is taken in haraam ways such as
stealing, deceit and so on.
We ask Allaah to guide you and give you strength, and to guide your
father and enable him to repent.
And Allaah knows best.