Is it possible to remove filtering from a child account?

[Microsoft Windows]

The child in question is nearly 18 and has somehow set himself up on as part of a family group, He was the owner of the group and it's only member and he was getting all sort of restrictions on his Xbox console. We figured out how to sign and and "leave" the family, but the restrictions were still in place. On my Microsoft account, I went to the family site and added him as a member having never used the family settings before. Once he accepted the invite, I removed all restrictions that I could find for him, yet he is still seeing the restrictions.How do we remove these?!

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