Personally, I figure it's not worth the time to dwell too much on it. How people would like to react in dire circumstances tends to have rather little to do with how they actually do, so worrying about it beforehand seems a tad pointless.

As for the OP, eh, so pointless. All other things being equal people prioritize those they're familiar with, nevermind now blood relatives or your own darn offspring. We're put together that way. Doesn't mean we need to like it of course, but, well, life's a dog of the female persuasion.