Join a Family Sharing group in iCloud
You can join Family Sharing when the organizer adds you, or you can join later by accepting an invitation.
If you’re the family organizer, you can invite people to join when you add them to the family; see Change Family Sharing settings.
For information about changing Family Sharing settings using an iOS device, see the Apple Support article Set up Family Sharing.
Join on the organizer’s Mac
If you’re nearby when the family organizer adds you to the family, you can join the family immediately by entering your Apple ID and password on the organizer’s Mac or iOS device.
Before you can share family purchases, you must confirm the Apple ID you use for the iTunes Store, the App Store, and Apple Books purchases that you want to share with your family.
On the organizer’s Mac or iOS device, enter your Apple ID and password.
On your Mac, choose Apple menu
> System Preferences, click iCloud, then make sure you’re signed in to iCloud.Click Manage Family, click your name on the left, click Options on the right, then follow the onscreen instructions.
Accept or decline an invitation on your Mac
On your Mac, choose Apple menu
> System Preferences, then click iCloud.Click Manage Family, then do one of the following:
Join the family: Click Accept, then follow the onscreen instructions.
Don’t join the family: Click Decline.
If you have an email invitation sent by the family organizer, you can click View Invitation in the email, then follow the onscreen instructions.
After you join, family members receive an email informing them that they are now sharing with you.