Apple gives iCloud users 5 GB of free storage, but that fills up fast with iCloud Photo Library, iOS backups, iBooks, and more. Until iOS 11 and macOS 10.13 High Sierra, each family member had to buy extra iCloud space separately. Happily, Apple has now made it so everyone in a Family Sharing group can share a single 200 GB ($2.99 per month) or 2 TB ($9.99 per month) plan. The family organizer can start sharing storage in High Sierra or iOS 11 as follows: on the Mac, go to System Preferences > iCloud > Manage Family > My Apps & Services > iCloud Storage; on iOS, go to Settings > Your Name > Family Sharing > iCloud Storage. Any other family member can then cancel their paid plan and join the Family Sharing plan using their iCloud Storage screen.
