Q. My 5-year-old son has started kindergarten. He's never been aggressive and has always respected boundaries with caretakers. On the other hand, my 3-year-old nephew, whom my son has been with in day care two days a week, is extremely aggressive. He does lots of hard pushing, pulling on clothes, taking toys, screaming and biting. He's bitten my son six times in the last nine months. My sister-in-law yells at him, but it doesn't seem to help.

Here's my question: What does it mean if my ...

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