I've found proton's mail/calendar to be pretty good so far. Sharing works great if everyone has proton. If they don't they can share an invite and you can add it to your calendar but you won't get their updates unfortunately.

Thanks! I switched over to private email provided by my domain host. It was a cheap and easy alternative. I haven't done this for my family, though, since I feel that's their call whether to stay plugged in. As far as labels go, I don't really use them, so there wasn't much need for compromise.