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Good relationships with siblings may buffer the effects of family conflict -- ScienceDaily

Adolescents who witnessed conflict between their parents had greater distressed responses to conflicts a year later, and greater distressed responses, in turn, predicted mental health problems in the teens in the subsequent year, the study found. However, teens who had good bonds with their siblings were protected from experiencing these distressed responses when they witnessed their parents' conflict, and ultimately were protected from subsequent mental health problems. These protective effects were similar for siblings of different ages and combinations of genders.