Ok, so I can't possibly read all the four pages y'all have managed to write in just half a day but to answer pom's question.
That dozen families is out of 50 (roughly) other Russian(ish) families that I know. Actually, I have to amend what I said before. I know about two dozen out of 50 Russian (ish) families where husbands cook more than, or at least as much as, the wives.