Hello Jasper Sallak,
Welcome to Microsoft Q&A forum.
I understand that you'd like to know how to let your son send friend request on Minecraft. If he is in your Microsoft account family group, you will need to change his Xbox profile privacy settings.
- Go to xbox.com/privacy and log in with the parent account.
- Find your child's gamertag in the profile list and select it.
- Switch to "Windows 10 and Xbox Online privacy settings.
- Make sure "... can join multiplayer games", "... can send friend request" and "... can join cross-network play" is set to Allow.
- Scroll down and click "Submit" to save the change.
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