If you're like a lot of parents, one of the reasons you had a second (third, fourth, ...) kid was because you wanted them to be friends. You imagined that your kids would be best buddies. But now? You watch how they play with the neighborhood kids. They are super polite and kind. They love being with their friends. But when they get home, the claws come out and they treat each other like bitter enemies. Have you missed the mark? Will they ever speak to each other as adults? Should siblings be best friends?