I got 2 bidets from tushy. Super easy to install and now I despise shitting away from home. I’m so much more clean using water instead of a piece of (toilet) paper.
If you want to try to convince your family then look up that Pulp Fiction scene when Samuel L Jackson explains that if a piece of shit was on your (face) cheek then you’d probably want something more than a piece of paper to clean it up. He obviously explains it better.
Or just buy it and install it without them. They don’t have to use it and your booty will thank you.