A surprising new study — or unsurprising, depending on who you are — suggests that the middle child takes the cake when it comes to certain personality traits. There's no denying that birth order ...

A research study on siblings and alcoholic use disorder, The Development Unfolding of Sibling Influences on Alcohol Use Over Time, is worth noting. The researchers, who included professors and a ...

Where kids are born in a family can be important. But it is not just about who gets more grown-up privileges or parental pressure. Research tells us firstborn children, on average, tend to do better ...

WASHINGTON — People who grow up with lots of siblings are more likely to marry — and to stay married — than are only children or those who grew up with one or two siblings, a new study has found.

Feel like your parents always favored your older sibling? They might have benefited from that more than you realize. A new study suggests all that extra attention makes first-born children smarter ...

The study reveals that children without siblings or with half- or step-siblings enter puberty earlier than children with biological siblings. "We found that only children enter puberty significantly ...

Our study shows younger siblings spend more time on screens than big sisters, brothers ...

Feel like your parents always favored your older sibling? They might have benefited from that more than you realize. A new study suggest all that extra attention makes first-born children smarter than ...