What could possibly go wrong?

So, he's currently living where? With your parents, or with your father? And he wants to swap that for living with you? If it doesn't work out, you have the option of "sending him home?" Have I got the outlines of this correct?

At the very least, you're bound to learn something from this experiment. You and your brother don't like each other. He wants to basically use you. But you won't get into it with him, as long as you take meds? I like to know the name of these magic pills and get me some.

If he came to your door on a bitter, winter night and said, "I'm freezing and have nowhere to go." then I could see you taking him in. I would. But, if he currently has a warm place to sleep, then you might want to leave that situation undisturbed. You may be destabilizing him by giving him the option of leaving where he is at.

I gather he's wanting to leave where he is at because some aspect of his behavior isn't going over too well there. You're going to dislike it just as much. He doen't really want a real job. He probably can't handle it.

I went through something like that with my brother. I felt sorry for him because my parents weren't very nurturing of him. I will always feel sorry for him. Anyway I could help him, I would . . . and have. He is a broken person. On and off, he entertained some fantasy that he and I living together could both be better off. That all fizzled out. I think you're getting into a situation that will just lead to worse hard feelings between you and your brother. That's what happened to me.