How to split up an Apple ID among family members and forward their email

It’s easy to wind up with a single Apple ID account for your entire family, and then want to migrate to individual ones.
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Apple
    Related:
  • iCloud
  • Apple ID
Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.