Yeah, what they said!

There is no reason to tolerate this kind of behavior. It doesn't make you a bad sister to say, "Hey, I don't deserve this, and you need to grow up and be responsible for yourself!" Kick his butt out, and if he comes to your home drunk, banging on the door, or whatever, call the police! Yes, I'm serious. You're not a bad sister if he's acting crazy and possibly dangerous, and you call the police. Give him resources to get help, and that's all you can do. It's up to him, not you, to take care of himself.