C.M.
mine are 5 and 7 and they have been fighting a lot lately. I think it's because summer is too long and they are just tired of each other. First, once I can calm them down, I have each of them tell me their side of the story. Who ever is telling their side, the other is not allowed to interupt. Then we switch, and the other can tell their side. It's usually a misunderstanding between them and it just escalates into something bigger. Also one other thing I have them do is for every mean/not nice thing they say to each other, they have to say 1 nice thing to each other.