Do you want this social media to be for your family to use only with family members or for them to use with family and beyond?
Revolt could be good as a local family group chat if you like the discord style. You’ve probably already tried it but Pixelfed/mastodon/misskey sound like the easiest to get family on board with and seem like they would be good family social media platforms IMO.
Understandable concerns and reasonable response assuming it’s true. I hope it remains open source because I spent so much time moving over and getting my family on board and using it. I’d hate to have to move again.