My friend is alcoholic, suicidal and surrounded by what, I presume, drives his depression - what can I do?

I’ll be as short as possible.

Friend of 15+ years. He still lives at home with parents. Dad is old-school. Mother is recently very sick. Grandfather JUST passed away. Friend is grossly overweight, depressed, and fights his alcoholism. He is also a pathological liar. All of his friends are getting married and having kids around him…and he is at home and addicted and depressed.

The other night, he supposedly drank 2 bottles of alcohol and his father found his shaking on the living room floor. I live in NYC, he in Boston, and I’ve just come to visit. I take this as an attempted suicide. He has been seeing a therapist and has been clean until this episode (perhaps for 3, 4 months).

His parents are unsupportive as I find they need to be. In my opinion, he should be in a 24-hr rehab institute, where he works on his problems, one by one, in private, and without family or social pressures. Is this bourgeoisie of me? How can I make this happen? Is there something in this equation I am missing? I don’t want to overstep my boundaries, but I am not watching (another) friend die of addiction.