Dividing
   one’s legacy and excluding a son who does not pray
Question

                A person is living in a kaafir country,
      and one of his sons does not pray at all. We know that not praying is kufr and puts a
      person beyond the pale of Islam. The system in that country allows a father to say before
      he dies how his estate should be divided. Is it permissible for him, or is it obligatory
      for him, to write a will with a lawyer stating that if his son does not pray, the estate
      will be divided and he will be left out, and the estate will be shared out according to
      Islamic shareeah among the other heirs?
Praise be to Allah.We put this question to Shaykh Muhammad ibn Saalih
    al-Uthaymeen, may Allaah preserve him, who replied as follows:
There is nothing wrong with leaving instructions in one's will
    that if this son does not return to Islam before the father dies, he will have no share of
    the inheritance.
Question:
Can he write down specific shares with the lawyer?
Answer:
He should write it down according to Islamic law, because he does
    not know, some of the heirs may die before him.
So he can write in his will, kept with the lawyer, that his estate
    should be shared out according to Islamic law, and that if this son is not praying and has
    not returned to Islam before the father dies, he will not have any share of the
    inheritance.
And Allaah knows best.