child account
How do I delete or remove a child account from family sharing?
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You can transfer the child to a new family.
Family Sharing - Transfer a child to a different family group - Apple Support *
Some people have been able to delete extra accounts using the steps in the articles below.
All purchases made using an Apple ID are tied to the ID. Delete the ID and you will need to download them using your new ID. There have been posts by people who have contacted Apple Support and they were told that if you delete an ID associated with an email address, you can never reuse the email address for an Apple ID. Make sure that you sign out of all your devices to avoid issues with apps that use your Apple ID account or iCloud. After your account is deleted, you can't sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device when your account is deleted.
How to delete your Apple ID account. *
What to do after you change your Apple ID or password - Apple Support -