The researchers emphasize that these differences are a result of the unique environment for twins—such as sharing parental ...

If this sounds familiar, you aren’t being immature – you are experiencing adult sibling rivalry, a phenomenon rooted in decades of shared history. While the “mature” response is usually to stay quiet, ...

Brother and sister relationships have tremendous influence over children’s adjustment and development — about as much as parenting does.

When parents catch behavioral issues in their younger children such as aggression, defiance, rule-breaking, or difficulty controlling impulses, the first instinct may be to adjust their parenting ...

Twins often do not pick up new skills as fast as their single-born siblings in their early years, according to a study by the ...

Marissa Nivison receives funding from the Social Sciences and Humanities Research Council of Canada. Sheri Madigan receives funding from the Social Sciences and Humanities Research Council, the ...