One family member in iCloud+ not using

Hello Toyboy,

Thanks for posting in Apple Support Communities. It appears that you're not able to share iCloud+ with one of your family members. The following steps may be able to assist you:

"Share iCloud+ with everyone in your family

To share iCloud+, you need iOS 11 or later, iPadOS, or macOS 10.13 High Sierra or later. For the best experience, make sure that your family members' devices meet these requirements, too.

Learn what to do if a family member already has iCloud+

On your iPhone, iPad, or iPod touch

In iOS 16 or iPadOS 16 or later:

1. If you haven't set up Family Sharing yet, set up Family Sharing. 
2. Go to Settings > Family. 
3. Tap Subscriptions.
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.

In iOS 15 or iPadOS 15 or earlier:

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."

More details here: Share iCloud+ with your family

Let us know if this helps.

Take care.