Sibling rivalry can be intense between young children. (Impersonating angry parent) Leave me alone while I'm combing your sister's hair. It's easy to imagine a mother or father barking those words to ...

No one quite knows how to push your buttons like a sibling. If you’re a parent, you’ve probably watched your kids bicker, compete, and make up, sometimes all in the same afternoon. It’s easy to wonder ...

Sibling rivalry might not unique to humans. New scientific research shows that baboon siblings in southern Africa also feel jealousy toward each other. Sibling rivalry can be intense between young ...