Hello and welcome to Apple Support Communities efwguitarist52,
Thank you for contacting us. You have come to the right place and we are happy to assist you. We understand you're adding songs/playlists to your account. We can understand why you’d reach out for a solution. To start, make sure you have the most current operating system on your device. (Settings > General > Software Update) When you have family sharing set up and use Cloud storage sharing, everyone in the family shares the storage. Below we have included 3 resources regarding iCloud with Family Sharing. We have also included links for iCloud+ now available and may be ideal for you with the amount of storage the family will need.
Manage your iCloud storage
Share iCloud+ with your family
iCloud+ plans and pricing
If you need further assistance after following the link above, please don't hesitate to reach out.
Thank you for contacting Apple Support Communities.
Best regards.