Positive relationship with siblings improves mental health and lowers the risk of engaging in risky behaviours during adolescence suggests new research. Individuals learn how to interact with others based on the relationships they have with their siblings said one of the researchers Sarah Killoren assistant professor of human development and family science at University of Missouri in the US. Siblings who are hostile and negative with one another will use that interaction style with their peers. Most peers won't respond well to hostility and negativity so these youth may be more likely to hang out with a deviant peer group