I'd like to invite someone to be a user on my Nest account (Just for thermostats/cameras), but I don't want to migrate the account to google. When I try to invite them it seems to be insisting that I have to migrate the account in order to do this. Is that true?
Sorry to hear about the issues that you're having with inviting a family member, I'm sure it's confusing, but I'm happy to help.
I would suggest reviewing this article as it will help you with inviting a new family member to a household.
Please let me know if you have any other questions.