If they stay that long.
I am the oldest of 4 my middle sister got saddled with our baby brother after he blew the money he sold the paid for trailer our mom had owned o her death. He always lived with her. He is a alcoholic. Only keeps a job because they cover for him. I am not that tender of heart for people like my brother. He will not admit he is an addict, nor seek medical help. He is 52,looks 75. Shakes, can barely walk, DT’s after 2 hrs and no booze. I’d let him pass out and call the cops and say he was screaming irrationally about committing suicide. And let them haul him off for 30 day mental evaluation.
He need not come to me, baby sis does not want him either.
Almost every family has a dead lick in their midst including mine. When my mother passes “he” is in for one hell of a wake up call.
From your description, it sounds like baby bro is doing himself in and probably won’t make 60, maybe not even 55. Sad when people choose to do that, refuse any meaningful help. I’m sorry you’ve had to live with that.