Sibling relationship quality and psychopathology of children and adolescents: A meta-analysis

► We did a meta-analyses on child sibling relationship quality and problem behavior. ► More sibling warmth was linked to less internalizing and externalizing problems. ► More sibling conflict and differential treatment were linked to more problems. ► Effect sizes were stronger for conflict than for warmth and differential treatment. ► Significant moderators were gender combination, age difference and age period.