That seems like a strange theory, not to say it isn't right. Generally doesn't it happen where the guy will kill everybody one after another and them himself right afterwards? I'm not expert on these things but that seems really strange that a guy would kill his wife, with their kid home, then kill the kid a day later while he leaves the body in the front room. Then he waits another day to kill himself? That just doesn't add up in my book.
That's exactly what I was thinking. Nothing adds up in this story. But I guess if you're willing to kill your wife and kid, logic goes out the door. Just a sad situation any way you look at it.