It doesn't just happen at school. A new study says bulling at home, by a brother or sister, can have the same harmful consequences for child and teen vitims.

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The study appears in the july issue of the journal pediatrics.

"What they find here is just as damaging to be bullied by a brother or sister as it is to be bullied at school," said ABC's chief health and medical editor, Dr. Richard Besser. He added that parents need to show their kids they have zero tolerance for bulling. "You should make sure that when you do see bullying you seperate kids and you should look out for positive interaction between children.