Ayways, I tried AT$T FamilyMap, and it's horribly inaccurate. If a half mile radius is accurate enough for you, check it out, but I find it too expensive for what it does. It was helpful when my wife was driving out of state to visit a friend and got lost, and I could give her directions to get back on track.
I'd really like a solution that enables recovery of a stolen phone, so it needs to be very accurate and difficult / impossible to disable, at a reasonable price.
I fail to see what's wrong with tracking your kids, btw. As long as I'm responsible for their actions, I'd like to know what they're up to.