How do we get family share to share the calendar on all five of our IOS devices?

[iMore Question]

We have two family members, but can't get sharing (i.e. the calendar) on all five of our IOS devices. All are IOS8 or above and one is the iMac. How do we do that?

 

[kch50428]

iCloud - Family Sharing - Apple Support

iCloud - Calendar & Reminders - Apple Support