Upgrade to Apple Music family plan

Hello Mr-Woods,

Thank you for reaching out to Apple Support Communities.

You would need to set up family sharing then switch to a family plan: These steps should help:

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.

As outlined here: Get an Apple Music family subscription

"Switch your subscription plan on your iPhone, iPad, or iPod touch

1. Open the Settings app. 
2. Tap your name, then tap Subscriptions.
3. Tap the name of the subscription that you want to change.
4. Tap See All Plans, then follow the onscreen instructions to complete your purchase.
5. If you chose a subscription that you can share with family, turn on Share with Family. (Don't see Share with Family? Set up Family Sharing or join a family, then return to your list of subscriptions and turn on Share with Family.) If you don't want to share the subscription with your family, turn off Share with Family."

More details can be found here: How to switch to a different subscription plan

If the issue persists, let us know what happens when you attempt to set up Family Sharing. Also, what happens when you attempt to change your subscription.

Cheers!