About the fathers being parents, maybe one two villagers have a kid, they could be sorta linked in their menu like the kids are to their parents now. Then you could drop the mother on the father to "Give the baby to dad". The mother would still not be able to breed again in those two years though. (She needs some rest). It could apply to the father too, but sometimes you end up needing one male to father the whole village to be able to get by, so it might not work out as well.