Any experiences with family only mastodon servers?

Hi, i’m curious if any of you have any experiences setting up and using a Mastodon instance for your family/social circle only?

I’m thinking it could provide an experience like the early Facebook, where you saw posts from people you actually cared about. And not just a bunch of ads disguised as content.

If you have experience with it, how did you convince your family to move over to the server? Does it get used and are there any unforeseen complications you hadn’t expected?