Modern research echoes Adler’s theses. In simple terms, siblings differentiate themselves to reduce direct competition. If ...

While sibling rivalry often captures more attention, it is the moments of sibling revelry that truly fortify familial bonds and contribute to psychological well-being. Sibling relationships are among ...

Children breastfed for at least 6 months showed 27% lower odds of developmental delays when exclusively breastfed, and 14% lower odds with mixed feeding. Benefits were most significant for language ...

When we think about the relationships that shape us, we often default to discussing our parents. Decades of psychological research have explored the influence of parenting styles, attachment dynamics, ...

Eighty percent of American children grow up with at least one brother or sister—more than the number of kids living with their fathers. Yet, for more than a century, psychological research has largely ...

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 ...