Here we’re talking about the new Family Share feature, that allows families (of up to six members) to share calendars, media purchases and more. It also gives parents an approval notification on their device when a child tries to make a purchase.
Family Share can also be used for sharing iTunes media, music, movies, apps and books. You can set it so that it automatically shares photos, calendars, reminders and more with the whole family. You can see where are your family members.
This feature can of course be used with best friends who you share your moments with them.