Privacy
How to have privacy between to apple devices on the same iCloud?
iPod, iOS 10
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You cannot do so. If you share an Appleid there is no separation of data nor any privacy. All the system knows is the AppleID logging in. It has no clue what actual person or persons is using the AppleID. So everyone using that AppleID has equal access to anything linked to it - iCloud, iMessage, FaceTime, these forums, etc.
An AppleID is Apple’s system of a unique personal identifier for their online services. They were never intended to be shared.