Apple Music Family Sharing
If someone leaves one family plan to join another family plan, will they lose the music they already downloaded through Apple Music?
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See the "What happens to your content when you stop sharing?" section in:
Leave Family Sharing - Apple Support
When you leave Family Sharing, your Apple ID is removed from the family group and you won't have access to any services shared by your family. This might include an Apple Music family subscription or a shared iCloud storage plan.
