Yeah, No
When you take up babysitting, you should ask for as many details about your client’s kids as possible. What foods are they allergic to, what time should they go to sleep—you know, the common stuff. Also, you should inquire whether or not the kids have a bad habit of creeping around at nighttime.
One of the two kids the OP was babysitting would wake up before their brother, hide in dark places, and start mewing like the kid from The Grudge films. Did the kid also cosplay as the kid from the movie series? Probably not, but we’d still be freaked out.