I can't remove someone and can't press stop using family sharing
You do not have the proper privileges
to perform this action.
[Edited by Moderator]
iPhone 12 Pro Max, iOS 16
Question marked as
Seems you may need to talk with the administrator of the family sharing,
ie: the person who set it up, and invited you to join ...
and / or
there may be a password needed.
How to: Leave or remove a member from a Family Sharing group on iPhone – Apple Support