How to delete a Apple ID alias
How can I delete a child’s account and alias I’d from iCloud
iPhone 11 Pro Max, iOS 13
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Remove family members from a Family Sharing group on Mac
As the family organizer, you can remove people from the Family Sharing group. After you remove someone from the family, that person may be able to join or set up another family. However, each person may only join two families per year. (Rejoining a family or creating a new one counts against this limit.)
Children under 13 can’t be removed from a family (age varies by country or region). However, you can move a child to another group using Family Sharing.
For information about managing Family Sharing settings using an iOS or iPadOS device, see the Apple Support article Set up Family Sharing.
- On your Mac, choose Apple menu
> System Preferences, click Family Sharing, then select Family in the sidebar. 
- Select the family member, click the Remove button
, then click Remove.
The person you remove from the family keeps purchases paid for using the shared credit card, but immediately loses access to other things the family shares.
- Other family members’ items no longer appear in the Purchased section of the iTunes Store, the App Store, and Apple Books.
- DRM-protected music, movies, TV shows, books, and apps the family member previously downloaded are no longer usable if someone else originally purchased them. Other family members can no longer use DRM-protected content downloaded from the former member’s collection.
- In-app purchases become unavailable if the family member bought them using an app someone else originally purchased. The family member can regain access to the in-app purchases by purchasing the app.
- The family members’ photos album, calendar, and reminder list are removed from the family member’s devices.
- Family members’ device locations don’t appear when the family member uses the Find My app on a Mac, on iCloud.com, or on a iOS or iPadOS device.