A.B.
I tell all the kids, I have two, my sis has two, and my brother has two, as soon as they get to my house that they are to not hit, kick, trip, pinch, or call each other names and whoever does has to sit in a timeout (one minute for every year they are) and watch the other kids play. Once they get out of timeout, they have to say sorry and give hugs to the kid they were mean to. I don't know why but it really works for me.