I’m searching for a AI personal assistant that matches some requirements.

So, maybe this is too much of a stretch, or too much to configure, but what I search is:

1. Multi-device: I would like to have it in PC and Mobile at least.
2. Able to remind and forget: I usually write worldbuilding here and there. I'd like to it to learn and remind me of stuff sometimes. Of course, I'd like to be able to dpo the opposite, like when I ask some embarrassing stuff and would love it to not bring this info back.
3. Multi-user, family shareable: Could be nice if I had wifey and kiddos using it too.
4. Private: Not sell my informations on internet.

If you do know something like that, please let me know.