What is the ruling on a divorced mother taking alimony money from her ex-husband's family, knowing that it was earned from work believed to be unlawful (haram)? Should she stop taking it for fear of affecting her son, especially since she works in the private sector and cannot guarantee the continuity of her income?

If the grandfather's money is mixed with lawful and unlawful sources, it is not forbidden to accept what he gives, especially when there is a need. However, if all his money is unlawful, or if what he gives is from an unlawful source, it is not permissible to accept it except in cases of dire necessity. If the child is financially independent with other means, it is not permissible to accept what the grandfather or father gives from unlawful money. If there is a fear that the grandfather's financial support will cease, it is permissible to take it and then dispose of it by giving it to the poor, and then benefit from it when necessary.