You can choose which apps and games to include in your family grouping on a case-by-case basis.
Google Play’s new Family Library makes it pretty easy to share all the apps, games, and other content you’ve bought with other family members.
But sometimes there might be an app that you would rather not
be available to everyone in the group. Or, you may find some apps aren’t
opted in automatically. Here's how to remedy those situations.
In the Play Store, you’ll notice that apps that are eligible for family
purchase have a toggle on their description page. If there’s an app in
your family library that you don’t want there, then just flip the switch.