I cannot access Apple Music my brother shared as family

Hello BigTim23,

Thanks for connecting with Apple Support Communities.

Be sure that your brother has completed the following steps in order to share the Apple Music Family subscription with you:

"After you set up Family Sharing, eligible subscriptions are automatically shared with your family members. If your family members can't access a subscription, here's what to do:

1. On your iPhone or iPad, go to Settings, then tap your name.
2. Tap Subscriptions.
3. Scroll down and make sure that Share with Family is turned on. 
4. Tap the subscription that you want to share.

• If the subscription is individual or student, upgrade your subscription to a family plan. 
• If the subscription isn't made by Apple, it might not be eligible to share. To share a subscription, turn on Share with Family under Family Access."

More details here: Add a family member to your shared subscriptions

Take care.