To set up Family Sharing, you need to be signed in to iCloud on your iOS device. Go to Settings > iCloud. Tap Set up Family Sharing, then tap Get Started.
Confirm that you want to be the family organizer and that you’re signed in with your personal Apple ID. Follow the onscreen instructions to complete the process.
Family Sharing lets up to six people in your family share each other’s iTunes, iBooks, and App Store purchases without sharing accounts.