Does family share cost anything?
Apple offers Family Share, where you can share your iTunes etc with up to 5 family members. Is this service free?
iPhone 15, iOS 17
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There is no charge for Family Sharing and most features it includes, including sharing purchases, but if you want to share an Apple Music subscription, you do need the higher priced Family subscription for that. In other words, there is no charge for sharing music purchased through iTunes but if you want to share Apple Music streaming you will need the Family subscription.
See: How to share apps and purchases with your family - Apple Support
and
Get an Apple Music family subscription - Apple Support