THE MOTHERF*CKING SO CALLED FATHER, you are supposed to love your child(en) (in a motherly/fatherlu way) NOT WANT TO BAD FOR THEM YOU SHOULD WANT THE BEST FOR HIM!
I know the son is messed up too, he is in love with his father but you should try to explain to him that what he is doing is not good/legal, since the father already knows the son loves him
Your child looks up to you, dont lead them the wrong path and if they are going to the wrong path, help then get back to the right path