How Do I Get My Son Off Drugs?

He is my nephew and he lives with me. I take care of him and make sure that he has everything that he needs and wants. My brother is a drug addict and he does not take care of any of his kids. My nephew was adopted by my brother and his ex wife and neither of them seem to care about him. I have been taking care of him all his life. I want to adopt him and he does not want to ever leave me because for once in his life he has a stable home. He is only five years old and has been through more than any child should have to go through.

a friend asks for advise on how to handle her 16 year son whom she believes is abusing alcohol