While I admire your interest in understanding the issue at hand, I agree with most of the people here. The last palce you want to be is stuck in a domestic quarrel. It isn't your issue to resolve, and if the wife sees you backing him, it will only confound the problem.

Just hang low for a while, and hope the smoke clears soon.

And yes, my wife doesn't like kilts either...but I'm working on that, HARD.