I've been using session as my family chat. The only thing I dislike is its connection to Oxen. But it makes an interesting case for resistance to Sybil attacks. But that's not really in my threat model for family messages lol. I'm mostly happy we moved the fuck away from messenger. I'll probably move them to matrix, but I gotta wait a bit before switching them again lol
In terms of usability, it's not hard to set up and has been very stable for the 1.5 years we've been using it. Even getting my less tech savvy family on it was pretty easy.
It's not easy to make an account unless you port over your Instagram account. I attempted to make two separate accounts, and both were suspended instantly and I couldn't continue unless I uploaded a selfie. But I didn't really want to use my name ¯\(◉‿◉)/¯