Hello Jerryscomputer1,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well.
Did you share the subscription to the family's member's account or are all members using the same Microsoft account.
According to Microsoft, "with Microsoft 365 Family subscription, you can share your subscription benefits with up to five other people. You do this by sending each person an invitation or by adding them to your Microsoft family (with their own Microsoft account). After each person accepts the invitation, they can sign in (using their own Microsoft account) to www.office.com to install Office on their devices and access their own 1 TB of OneDrive storage. All member should have a private OneDrive account.
How to invite someone to share your Microsoft 365 Family subscription benefit:
1. Sign in to your Microsoft account, Sharing page using link below. Be sure to use the same Microsoft account that you used to set up your Microsoft 365 Family subscription.
https://account.microsoft.com/services/office/sharing
2. Select the Start sharing button.
3. On the Share your subscription pop up, choose one:
>> Invite via email
Enter their email and select Invite.
The email you use to invite them should also be the email they use for their shared Microsoft 365 subscription.
>> Invite via link
Select the Copy button to send the link via email, text, or other message to the person you want to share with.
When they click the link and sign in with their Microsoft account, they'll be added to your subscription. If you want to share with more than one person, create a separate link for each person.
4. If you chose to invite via email in step 3, select Invite if you want to add this person to your Microsoft family. You can always add them later too.
5. After they accept your invitation, they can sign in (using their own Microsoft accounts) to www.office.com to install Office on their devices and access their own 1 TB of OneDrive storage".
The steps above were obtained from Microsoft support article: https://support.microsoft.com/office/b389b9ce-3ae3-4a82-9017-39d79972fcba
Please let me know if you need more assistance.
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Warm Regards