Stop sharing purchases with your family members on iPhone
With Family Sharing, the organizer can turn on purchase sharing. Any purchases family members make from the iTunes Store, the App Store, Apple Books, and Apple TV are billed directly to the organizer’s Apple ID account.
If adult and teen family members don’t want to share purchases with family members, they can turn off purchase sharing for themselves.
Note: The family organizer can also require that children in the family group request approval for purchases or free downloads. See Set up parental controls with Family Sharing on iPhone.
Go to Settings
> [your name] > Family Sharing.
Tap Purchase Sharing, then turn off Share Purchases with Family.
If the organizer wants to turn off purchase sharing entirely, they can tap Stop Purchase Sharing.
If you don’t want to share a specific item with your family members, see the Apple Support article Hide and unhide music, movies, TV shows, audiobooks, and books.