Giving zakaah to a female relative if her son is going to take it and spend it on haraam things
Question

                Is it permissible to give zakaah to a poor female relative of ours, knowing that if we give it to her, she will give it to her son who will do bad and haraam deeds? Is it permissible to give it to her?.
Praise be to Allah.If the relative about whom 
    you are asking is entitled to zakaah because she is poor and in need, or 
    because she is in debt, then there is no reason why you should not give her 
    zakaah, rather it is better to give it to her, because it is both zakaah and 
    upholding ties of kinship. See the answer to question no.
    20278. 
But you should advise her 
    not to enable her son to spend it on haraam things, rather she should buy 
    him whatever he needs of permissible things. She can hide the money from him 
    and spend it on herself and her dependents.   
You should also advise the 
    son and call him to Allaah; do not despair of his being guided, for people’s 
    hearts are between two of the fingers of the Most Merciful, and He turns 
    them as He wills. How often has He accepted the repentance of a sinner and 
    how often has He guided one who was astray. 
If it is not possible to 
    hide the money from the son and prevent him from spending it on haraam 
    things, then the mother can take the money and give it to one of you, and 
    delegate him to buy what she needs. 
According to some scholars, 
    it is permissible to give her the zakaah from the outset in the form of 
    food, clothing and other things that she needs. This view may be followed in 
    cases such as this, if the son is going to take charge of the money and 
    spend it on haraam things. 
See also the answer to 
    question no. 42542 and
    79337. 
And Allaah knows best.