As far as kids, no red flags there...in every case so far (including my own son) the devil horns come out when parents are around and they are comparatively angels when it's just me. As for parents, I've found that the ones who have the fewest questions for you are the ones who will be late with payment, forget supplies etc. Does anyone ever ask to call previous caregivers (on the premise of gaining more info.?). I haven't, but it would sure give a lot of insight