Greetings,
I am having an issue with the same thing. Our payment method expired, and when I updated it I can't see how to make sure that the family members were updated as well, additionally I can't see what plan I'm on to make sure that it is the correct one. The only options available is to Upgrade, but I've already agreed to the Family Plan.
@nussnacker Sorry for any trouble.
I have created a ticket with our support team for you.
They will be contacting you privately via email to help set you back up with your Premium Family plan, so please keep an eye out for their message.
Thanks for your patience in the meantime!