My wife's grandmother died with my wife present and that put in motion this whole "life is short" attitude. She also blamed me because I was not there in Georgia. I was at home working so I got the blame for not being emotionally available. Jeez.
One thing to remember is that our wives are way ahead of us when it comes to being checked out. We are just at the beginning of the grief stage, they already have processed the anger, the grief, etc... They have had months to process it while we are blindsided. Does this sound familiar to you?
All we can do is just wait it out. It blows but hold onto your sanity and take extra good care of your beautiful kiddies. Make sure you care for yourself - eat and sleep and exercise. This will help with your feelings of shock.