If you want to buy a smartwatch for your kids, or you want to have your kids wear something you can track, but them an Apple Watch SE. It has cellular and GPS, you can call them, you can see where they are, but they can't do much with it besides call you (and people you approve) and text people on an approved list.
It's private, it's secure, and it works with the stuff you already have.
It's private, it's secure, and it works with the stuff you already have.
[0] - https://www.apple.com/apple-watch-for-your-kids/