I've often wondered this myself. Lots of parents who have children that they want to be actors will lets their kids do whatever the studio wants them to do. They really minimize the kid's part in the show, if you watch, they really only appear in 1 to 2 scenes, say vague generalities about their privates and look sad.
There are all sorts of people on set who wrangle the kids, make sure they only work certain hours, approve the things they say, etc. The kids just think of it as a job.
Parents will agree to anything to get famous kids. It's sad, but I doubt there's any really bad schtuff that happens on set.
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Aspie Score: 170 of 200
NT Score: 37 of 200