Hello Kmcnamara85,
Thank you for using Apple Support Communities! I understand from the information you provided that you’re concerned that if your family set’s up a Family Sharing plan for Apple Music you will each loose your music and playlists; I'd like to help.
When you set up Family Sharing you each keep your own Apple ID, because all your purchases and playlist are associated with the Apple ID, you will not loose anything. The following support article provides some more information about Family Sharing:
Set up Family Sharing - Apple Support
Hope this helps.
Best Regards.