Edit: While we are excited about the new features in macOS 10.13, High Sierra, we are recommending to NOT upgrade as of December 18th, 2017. In fact, kGinger Consulting managed clients are blocked from installing High Sierra until we have confirmed stability and compatibility. We hope to greenlight and automatically deploy macOS 10.13.3 in Q1 of next year.
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 person in a family 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; in 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.