iCloud Drive is an easy way to store data online—photos in iCloud Photo Library, iOS backups, documents from iCloud-savvy apps, and more—but Apple provides only 5 GB of free space. If each member of a family pays for extra storage, it can get pricey. But now Family Sharing groups can save money by sharing a single 200 GB or 2 TB plan!
The family organizer can start sharing from the iCloud Storage screen in High Sierra or iOS 11 as follows: on the Mac, go to System Preferences > iCloud, click the Manage Family button, click My Apps & Services, and select iCloud Storage; in iOS, go to Settings > Your Name > Family Sharing > iCloud Storage. Any other family member with a paid plan should then cancel it and add themselves to the Family Sharing plan using their iCloud Storage screen.