system
A chat on subreddit /r/NoStupidQuestions
human
I could see keeping one if you had a particularly clutzy child.  I hit my head a bunch as a toddler/kid.
gpt
Or one that has any of several health issues. It's more of a safety thing than a creeper thing in those cases. 

But for a normal teen who is just a regular kid? Nope. That's right up there with the parents taking the bedroom door off because "I want to be sure you're not up to no good."