Your diagnostic impression is that you are dealing with a 12-year-old child who is showing signs of conduct disorder. At school, he is acting out in large, undeniable ways that are characteristic of more severe diagnosis, such as CD. However, at home, the parents deny seeing any of this activity. As a next step, you might examine:

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Asking a family to visit their home can sometimes be a challenge. After all, you would be considered a guest and even for this 12-year-old, the rule may apply that you treat guests with respect. Still, you would need a picture of what exactly behavior means at home, even if you're not excited about the answers you'll find.

Your Diagnostic Impression Is That You Are Dealing with a 12-Year-Old