And so the story goes, that the woman you marry and have not for once raise a finger on her was beaten up by her brother over an argument! What Would You do under such circumstances?

Lock him up and throw the keys away

That's blood feud sir. You've got a crazy in laws there for them to be fighting like dogs. Lock both of them up and let them bail themselves, and then tell their parents while you are at the work.. I wouldn't take side because it is a blood feud, I know I am not making sense but please bear with me.