Cool down and think about it rationally. How can you best be compensated for your pain and suffering? If you get revenge, then you're even, and you get absolutely nothing except some mutual loathing. Doing nothing is better, but that just stops additional bad things, leaving you with nothing. The best option is to use your broken jaw, and hold it over him to extort him as often as humanly possible.
"Hey, could you give me a ride to the store? My cars not working"
"I really don't want to..."
"You sure? I mean, I could ride my bike, but the bouncing kind of hurts my jaw. Which you fucking broke"
"...fine"
"Hey Brother, mind paying for dinner?"
"Why can't we just split it evenly?"
"Well, I didn't want the family to eat at this expensive place. I wanted someplace cheaper. But the food here is so tender, its easier to chew. It doesn't hurt my jaw. Which you fucking broke"
"...ah...right..."
And here's the best part...
"Hey, this isn't fair. Every time you want to exploit me for something, you bring up me breaking your jaw. It's all I ever hear and it's not fair."
"You're right brother. I do exploit you by bringing up you breaking my jaw. Do you know why I can do that? BECAUSE YOU BROKE MY MOTHERFUCKING JAW!"
With a little deft social manipulation, You could probably coerce him into doing you favors at your retirement party.