Apple One has different subscription levels. If you subscribe to a family level plan then other family sharing members will automatically be able to share in the features. Make sure Purchase Sharing is enabled for your family. Here's more information about Apple One and its plans:
Bundle Apple subscriptions with Apple One - Apple Support
https://support.apple.com/HT211659 for a list of plans and included features
and
https://www.apple.com/apple-one/ Cost at the very bottom.
If others cannot see your purchases, refer to this document --> If you don't see your family's shared content - Apple Support
I would advise trying solutions in that document, as well as contacting Apple about resolutions first before having people leave and join the family. Apple places restrictions on rejoining families. This would be okay for them to try once but if they should wish to join another family they would have to wait a year. In other words, I wouldn't start the timer going on this just trying this as a solution before you exhaust all other possibilities. There are better solutions.
https://www.apple.com/legal/internet-services/itunes/us/terms.html
D. "You can only belong to one Family at a time, and may join any Family no more than twice per year. You can change the Apple ID you associate with a Family no more than once every 90 days. All Family members must share the same Home Country."
September 16, 2021
If you still have questions or problems:
Contact Apple. Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232
