How do i remove a child from family share
hOw do i remove a child from family share
Family Sharing and Apple ID for your child - Apple Support - https://support.apple.com/HT201084
Leave Family Sharing - http://support.apple.com/HT201081- "The family organizer can remove anyone over 13 from the family group at any time."
If your child is under 13 (age may vary according to country) you can't.