You and your family's welfare is something I will pray for. Cancer is an ugly beast that has affected my family as well. I'm always amazed at the resiliancy of children when it comes to cancer...Like they're getting a little "boost" from the guy upstairs.
It must be so painful to watch your kids go through such an ordeal, as they just don't understand or know how to deal with these situations quite as well as us more seasoned folks. However, the one thing I always say is that life's hardest moments sometimes give us with life's greatest memories (later on of course).
I hope these trying times will eventually make for positive discussions many years from now (how this situation caused your family to come together and possibly grow stronger as a result).