Hello Boymom_.
Thank you for using Apple Support Communities. First, let's confirm that your family members are showing up in the Family Sharing group. On your iPhone, navigate to Settings > [your name] > Family Sharing > iCloud +. This section should show you which family members have access to iCloud +.
If you don't see them listed in iCloud+ section, follow these steps here: Share iCloud+ with your family - Apple Support
1.) If you haven't set up Family Sharing yet, set up Family Sharing.
2.) Go to Settings > [your name].
3.) Tap Family Sharing.
4.) Tap iCloud+.
5.) Follow the steps to share your existing plan.
6.) Use Messages to let any family members with an existing iCloud+ plan know that they can now switch to your shared iCloud+ plan.
If everyone is correctly showing up in your iCloud+ settings, have everyone restart their iPhone. If that doesn't help, try updating all iOS devices as well. We hope this information is helpful. Cheers.