Teens with half-siblings are more prone to risky behaviors

08/11/2013 | HealthDay News

First-born children with a brother or sister born to a different father had a higher risk of using drugs and having sex by age 15 than those without half-siblings, according to a study presented at the annual meeting of the American Sociological Association. Having half-siblings was associated with about a 65% increased risk of using illegal drugs and a roughly two and half times greater likelihood of sexual activity by age 15, researchers said.

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