What do you think about the fact that I wish my brother never came back from prison?
Why do you wish your brother never came back from prison?
His return led to a number of things I don't like
Transition is always difficult. You are expected to embrace your family members and not wish them to stay away.  I'm sure things will settle down for the two of you soon.
I don't like him. I will kill him.
You don't have to like him -- but murder, seriously? If you're really feeling that angry, you need to seek help before you end up in prison. How would you feel if you came home needing a helping hand and discovered your brother was harboring murderous thoughts about you?