I'm worried and angry with my brother?

My brother is 14, I am 16. Ever since he turned 12 he's been steadily getting worse and worse in terms of calling other people bad things, escalating rude/crude behavior, etc. He calls me really terrible words and names for no reason. I don't react most of the time, but he still does it. I am really getting sick of it, to the point of whenever he is home I usually just stay in my room so I can avoid him. He also calls my mother very rude things, and occasionally he will hit her. Its not a powerful hit, more like an annoyed slap, but still, I've always thought a child hitting a parent was wrong. He will also upset my dad so much that he(father) will leave the room or the house. I understand some of this is expected from teenage boys, but is there anything that can be done to tune down his negative behavior? He reduces my mom to tears a LOT, probably at least once a week. I don't think my mom can handle him. I can't handle him, sometimes I think dad can't handle him. Is there anything that can be done at all? Or is this just a terrible situation I'll have to live through till I'm old enough to move out?