Father and son. Both had the same name. No Sr., no Jr., no II. Exactly the same name.
They had been in an argument. Father was drinking alcohol. Son was using PCP.
Son broke father's jaw with his fist. Father broke son's fist with his jaw.
Son's hand was splinted, and he left, with police, bound for jail.
Father was sent to local trauma center by ambulance for his broken jaw, because there is no one on the staff of my hospital who fixes broken jaws, wtf. Police didn't want to go with him, so they gave him a citation, and will try to remember to pick him up later. I'm sure the son will remind them.