@ehBeth,
Yes and the thought did cross my mind.
On that same note, a good friend of mine had children significantly younger than I did. And I used to think if there was a situation when we were together and it had to be her or me, I always thought that I would step in and protect her seeing she had young children needing her.
The bonus now is - I have a reason to be selfish.
And yes, I would probably if no other option push to survive over some one else for my children - same as I would not hestitate to put myself in a position where I wouldn't survive to save my children.