Hi @sfdavidson464
We ended up using a mix of off custom code and a different plugin. The only membership/user management plugin we found with something close to what we needed is MemberPress with their “Corporate Accounts” add-on.
https://www.memberpress.com/user-manual/memberpress-corporate-accounts/
This will get you half way there as it allows a “parent” account to sign up other accounts that will be linked to it and be visible (but not editable).
From there we added some custom code to get to exact solution we needed (actual parent/child family accounts). If you are interested we could put together a tutorial article on the modifications and setup we are using.
Hope this helps! Let me know if you have any questions ??