(USATODAY) — Bullying and aggressive behavior by a sibling can be as damaging as bullying by a classmate, neighbor or other peer, finds a new study that links it to increased depression, anxiety and anger among victimized kids and teens.

And that association holds true for the various types of aggressive behavior studied, both mild and severe, from physical and psychological aggression to property victimization, researchers say.

Although peer bullying has increasingly become a recognized problem and the focus of preventive efforts, sibling bullying has historically been viewed as “benign and normal and even beneficial” for a child’s social development and ability “to learn to handle aggression in other relationships,” according to the study, in the July issue of the journal Pediatrics, published online today.

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