I just told my brother to jump off a building
Why would you tell him to do that?
Because I hate family, especially brothers
Regardless of how you feel about him, that's not okay.  Telling people to do things that are harmful to them is not acceptable!
I don't care. He shouldn't have a life that I hate. I won't feel guilty.
That is terrible that you are thinking that way. It is never okay to tell someone to do something that will cause them harm. You should try and find things you have in common so you won't dislike him as much.