“The thing to keep in mind is that sibling rivalry, as annoying as it is, is an opportunity for children to learn important people skills, including negotiating, advocating for their point of view and giving in gracefully,” says Eileen Kennedy-Moore, a psychologist in private practice in Princeton, N.J.
That doesn’t mean you need to listen to endless bickering. “If they’re bothering you, tell them, 'You’re disturbing my peace,'" Kennedy-Moore says. “Have them go play in the basement or outside or in their own rooms. Separating them can solve a lot.”