[aylmao]

This essentially already exists if you put a little effort into it. You could set up a Diaspora, Mastodon or Pixelfed instance open to just to family members in some cloud cloud provider, and this way pay a monthly fee for a private social network.

It'd be awesome to see someone contribute back some automatic flow which gets you up and running in 5 minutes, instead of having to figure out how to run these in AWS yourself, for example. Could be a fun project though.