Hi Treybabyy
Re: Every time they click to play music it’s telling them to pay for Apple Music
Can anyone help?
Seems if you have set up Family sharing correctly before subscribing, and invited family, they should be able to access the music automatically.
As something is not working for them:
You might want to check through Apple support's online articles
Set up Family Sharing – Apple Support
Eg: tells what to do after they accept the invitation or how to resend the invitation
or
What to do: If you can't find your family's shared content - Apple Support
NB:
says: "To access your family's shared content, you need an iPhone, iPad, or iPod touch using iOS 8 or later, or a Mac using OS X Yosemite or later. If you're using an older device, you won’t see your family’s shared content".
or
If your Mom or best friend have an Android phone:
Use Family Sharing with Apple Music on Android - Apple Support
If needed:
How to: Add a family member to your subscriptions from Apple - Apple Support
More support:
There's a "Get Support" link at the bottom of the Music Support webpage:
Webpage: Music - Official Apple Support
All the best :-)