When Sara Kessler lost her 2-week-old baby, big sister Ruby, then 5, had trouble coping. A year and a half later when Kessler's next baby, Liv, fell seriously ill, Ruby was worried. "She had a hard ...

Two young brothers standing in front of a pond. Source: Vitolda Klein/Unsplash Numerous studies show that sibling relationship quality is important for well-being and relationship experiences with ...

Siblings between the ages of 4 and 8 can have up to eight fights an hour, Northeastern University psychology professor Laurie Kramer says. If you don't live with children this age, that stat may seem ...

We all know brothers and sisters often fight, but when does sibling rivalry cross the line? When does “picking on your little brother or sister” become bullying? We do research on bullying in schools.