Agreed. I guess this is for my own selfish comfort. I want to think there were some warning signs which might have prevented the tragedy, whether the parents might have known about them or not. There is something very discomforting about a tragedy that happens "out of the blue" as another poster said. Years ago I read the book, Helter Skelter, about the Manson "Family" and what disturbed me most was the randomness of the choice of victims. I like to fool myself that I can avoid most tragedies in my own life if I am attentive to warning signs or obvious risks. (Yes, I know that is a fools' errand, but I try to imagine I can prevent sorrows in most cases.) I don't mean to impugn the parents, just what are the signs of rat infestation? Or are there none?