Is it obligatory to execute the deceased's will to divide his money between his friend and the nursing home, thereby disinheriting his children, or is it permissible to give the money to his indebted son?

The friend must pay the money to the heirs of the deceased for them to divide it according to Islamic law, as an heir is not deprived of inheritance due to disobedience (uquq), even if it was a major sin. The friend's claim that the deceased willed half of the money to him is not accepted, because it is a testimony from which he draws benefit for himself. Likewise, a will to donate to a nursing home is not established by the testimony of one man; rather, it requires two witnesses, or one man and two women.