Our family is on G+. I am looking for a replacement (being the techie, getting people to migrate is on me). I am on Facebook, but who wants to be friends with t

Our family is on G+. I am looking for a replacement (being the techie, getting people to migrate is on me). I am on Facebook, but who wants to be friends with their parents? Yes there is mastodon, SSB (nice in theory), etc but those are essentially replacements for Twitter, haven't found anything that is a replacement for G+. I have gone so far as to consider setting up a usenet server. E-mail lists are an option, but I would love something with more privacy.