How does the family member cancel there personal subscription?
We just signed up from Apple One Family Plan. How do the family members port their individual music accounts over to the Apple One Family Plan?
See If you want to cancel a subscription from Apple - Apple Support. Each Apple Music account is attached to its own Apple ID. Once the family plan is in place each other member apart from the organizer should be able to cancel their own personal Apple Music subscription, leaving their iCloud Music Library intact.
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