It is hard to take them out of the situation when they are young, primarily because of divorce lawyers. Take advantage of every moment you have with them and build their self esteem and strengthen your bond with them. As time goes on, they will understand. They say in Alanon, do the best you can and turn the results over to God. If they believe in themselves and they trust you, you are doing all you can.
I have an older one (23) that I can't take out of the situation. I trust that she will figure it out. She has my blood running through her veins.