How many people can I add to Family Sharing on my iPhone?
iOS 8 allows one credit card holder to add up to six total people to its Family Sharing feature. This allows anyone in the group to share purchases made from iTunes, iBooks and the App Store. Users can also access family photos, a family calendar, locations, and more. The new group sharing option also includes an "Ask Permission" feature so the card holder can approve or disprove all future iTunes, iBooks and App Store purchases.