Family Sharing - Apple
https://www.apple.com/family-sharingFamily Sharing lets you and up to five other family members share access to amazing Apple services like Apple Music, Apple TV+, Apple News+, Apple Arcade, and Apple Card. 1 Your group can also share iTunes, Apple Books, and App Store purchases, an iCloud storage plan, and a family photo album. You can even help locate each other’s missing devices.
About Family Sharing for In-App Purchases : App Store Story
apps.apple.com › us › storyOn the Family Sharing page, select the Purchase Sharing option, which will allow you to share eligible in-app purchases. Be sure that Share Purchases with Family is enabled under Purchase Sharing. If you have any in-app purchases that you do not wish to share, you can disable sharing by hiding the app in My Purchases. Note: Not all in-app purchases are shareable.