I know it was the father's first time working a late night shift on this job, but do we know how often he worked these hours in the past. For a person who's not used to it, driving up to your house and walking up to the door at 4am might feel unusual in itself. Everything is so still and quiet at that hour, and there's an expectation that your home will be that way, too, with your family members asleep. Seeing bright lights inside might not be alarming, but it would give you pause. On top of that, you notice an open window with a pushed in screen and the front door unlocked. I'd be surprised if he did shrug that off, especially knowing his wife and three small children were inside. Waking his wife to find out what was going on, or if something had happened earlier seems perfectly reasonable to me. And the darn thing is, if we'd heard that he did nothing, we'd be criticizing him for that.
