Hey Scooby_212,
If you have an Apple Music Family subscription, any family members with existing individual subscriptions will have their plans automatically cancelled and will then fall under the Apple Music Family plan. You can learn more about that here: Get an Apple Music family subscription
"First, set up Family Sharing
Set up Family Sharing on your device. Then invite family members to join your family group.
If you already set up Family Sharing, everyone in your family group will automatically have access to Apple Music after you subscribe.
Already subscribe to Apple Music? Learn how to change to a family subscription.
If someone in the family group already has an individual or student subscription to Apple Music, renewal of that subscription is automatically canceled when they join the family group."
Thanks!