I think he did wake up, but didn't make it down until she was slicing at herself. I think he interrupted her and she didn't get to finish. He saw what she did and went crazy on her (hence the bruises).
He then helped her cover stuff up and make it look like someone "broke in." They wouldn't turn on each other at this point because they are both responsible in some way. I think this man loved his children, but maybe he just loved his wife more.
[SIGPIC][/SIGPIC]
"I will be buried in a spring loaded casket filled with confetti, and a future archaeologist will have one awesome day at work."