The way I find my brother and I get along (with 7 years between us) is that you should actually talk to him. Little kids aren't as stupid as you think. You sit them down and go "So-and-so, it makes me sad or hurts my feelings when you act like such-and-such a way. You wouldn't want me to act that way with YOU...would you?" Make sure you seal the deal with a loving kiss on the head, or hug, or something. Remember...give him respect...and you'll be surprised with the results. Does anyone else agree with me?