Change Apple ID that had organizer now deactivated
Change Apple ID payment that was controlled by organizer, phone has been deactivated
iPhone 12 Pro Max, iOS 15
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Mike,
If a Member wants to leave the group (which would be a reasonable thing to do if the Organizer is no longer active), as long as they are over 13 they can remove themselves from the Family Sharing group:
Leave Family Sharing - Apple Support
Then they can put their own payment info onto their own account.