*There is no way no one could ever NOT notice.
It happens all the time, daddy just slips out of bed and heads down the hall...
Sure they could “not notice”.
The report says sexual incidents took place with people in the next room.
It does not say that either the pervert or the victim were unclothed.
The door is shut, the child is being groped or forced to do oral, and if the doorknob turns everyone will be sitting on the couch by the time the door opens. Looks like they were watching television.