Parents of more than one child, if you were in a life threatening situation, who would you save first?

This is an awful question. I wouldn't be able to live with myself knowing I chose one over the other.I have four children all 2 and under, so none of them would be able to fend for themselves. I think in a life threatening situation I would grab all four of them at once (Maybe by a limb or something) however I could get a hold of them.