It sounds like your brother is in dire straits. I would call a doctor ASAP and see if they can tell you what you can legally do. If he can be committed, voluntarily or involuntarily, that may be best for him short term. By your description, he seems to be pretty far down the path of destructive alcoholism. Just remember that if you find there is nothing you can legally do and you've exhausted all options of getting him to seek help, you've done all you can. You're not Superman. You may even try calling your local AA hotline and seeing if they'd be willing to send some people to 12th step him. It often happens that where a nonalcoholic cannot connect to a suffering alcoholic, a sober alcoholic, despite being a stranger, can.