Revenge ideas? (Nothing THAT mean) :)?

Honestly (and this may sound pretty standard) I think the BEST way to get revenge on this guy is just to spread the word about this story. Make it KNOWN what he's said to you and your siblings, and make sure the story spreads through the school. The more ppl know what a jackass this guy has been to you, the crappier he's going to feel about it. It's a direct shot at his reputation :)