I don't have kids so please take what I say with a grain of salt. It must be excruciating to whatch a child deal with this type of situation.
Shootingstar I agree with what you say; however, I would think teenagers have to come to terms with alcoholism and how to relate to an addict themselves (with as much guidance as they can accept). For most of us adults, figuring this out was riddled with mistakes, angst, and took time.
Lizatola, congrats that your son shares as much as he does about his feelings in the situation. "Program talk" probably means explaining setting boundaries and self-care and that the addict has the right to live as he chooses. Your kid sounds smart. Thanks for providing him with a home free of addicts.