What do i do if my 7 yr old son has been bullying two kids for being adopted?

I got a call from his teacher stating that he’s been bullying a set of boy/girl twins for being adopted. Their mom complained to the school and thats why the teacher called me. My son learned about their adoption when he overheard the family talking about it. I never imagined my own kid as being the bully! I took... show more I got a call from his teacher stating that he’s been bullying a set of boy/girl twins for being adopted. Their mom complained to the school and thats why the teacher called me. My son learned about their adoption when he overheard the family talking about it. I never imagined my own kid as being the bully! I took away his video games and he’ll be apologizing. How do I make sure that he never does this again?
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