A new study shows that adolescent siblings who respect each other's boundaries have a better relationship. While this isn't too earth-shattering, it's interesting that scientists are looking at sibling-relationship quality at all.

Middle kids rejoice — or despair: a child's actual birth order may matter a lot less than what parents think about that birth order.

Are first-borns really smarter — or more stubborn — than their siblings? A piece in the London Times questions whether birth order really affect IQ or personality as much as some have said.