Why should parents care that their children are fighting? In this video, I talk about how being pleasant and kind to one another has a more far-reaching significance than peace at that moment. Children who learn to resolve conflict within a family through interactions with brothers and sisters have an advantage when they encounter discord outside of the home. That also points to the most important reason why parents should assist their children in moving from sibling rivals to friends: They will not be children long, and the things learned—or not learned—in childhood can have a long reach into adulthood.