A father asking his son for money to use it unlawfully

Q: I would like to ask Your Eminence about a matter that happened between me and my father.He asked me to give him a sum of money when I went to Egypt coming from Saudi Arabia, and he wants that sum to buy narcotics, and even indulge in the illegal act of Zina (adultery). I live with my mother and three sisters as I am their only supporter after my father left them fourteen years ago. He does not give them any money and he is married to another woman. Is it permissible for me to help him with money regardless of how he will spend it? I inform you that his current wife is working and responsible for all household expenditure, and he filed a complaint against me in Egypt whereby he got five hundred pounds against my wish. After I came from Egypt he sent me that letter enclosed with the question. Kindly give us the legal opinion in this regard, may Allah reward you with the best. Should I pay him the money that he wants or not? I tell him that I will not give him any money as long as he does such acts. Am I sinful for doing that and being disobedient to my father? (Part No. 25; Page No. 221

A: If the matter is as you have mentioned, it will not be permissible for you to give him money if he makes use of it by committing such illegal acts which you mentioned in your question.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.