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Microsoft 365 and Office | Microsoft 365 Defender | For home | Android
An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
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Hello,
It looks like your son’s account might be attached to your Microsoft 365 account, you can change the attached email address through this link.
https://account.live.com/names/manage
Login and change the email address and remove any associations with your son’s account.
Here is a more in depth guide that you can follow.
Change the email address or phone number for your Microsoft account - Microsoft Support
Hope this helps,
JC