A: Siblings need to be taught to be each other’s best friend. And positive reinforcement works better than negative reinforcement in most sibling situations. Sit down with both kids and set up a "best friends club." To be in the club, they have to be each other’s best friend. Establish the rules: being nice to each other, no hitting, no tattling, hugging each other after a disagreement, and even defending each other to their parents. However, defending each other should never include lying to protect their best friend; the truth is always important. Try to minimize asking them about each other’s actions so they are not put in a position to rat out their best friend. Plus, being in the club will lead to special rewards and treats. Each day of being a best friend brings a special weekend event, outing, favorite meal, extra time with favorite TV shows, family movie nights, etc. Best friends have more fun together than sibling rivals , so show them how much fun it can be.