How do I remove someone from my family sharing
How do I remove parental control child Apple ID from family sharing?
iPhone 13 Pro, iOS 15
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Unfortunately an “Apple child” (generally <13 years-old; but with some variation between countries) can’t be removed from a family …
… they can ONLY be transferred to another family by the invitation of the other family’s organizer.
Move a child to another group using Family Sharing - Apple Support