A hard question to answer!

Today as I was driving the kids home from their grandparents house, my oldest child (7 years old) asked me why everyone was always praying for Daddy.  I told her it was because of his cancer and it was making Daddy very sick.  She then asked me if Daddy was going to die.  This was the first time any of my kids have ever asked me this.  I've been dreading this question for as long as possible but I know its time to be realistic.  I told them that yes, cancer could make Daddy die but we are hoping to make him better.  I said that is why Daddy has to take all this medicine so hopefully he doesn't die.  Not sure if this is the time to be answering this question yet, but I know when he has less than a 20% chance of living three years I am going to have to start being honest with the kids.  I also told them that I think its a good idea to start going to the cancer classes they have for little kids who have parents that have cancer.  I told them I think it will help them to better understand what Daddy is going through. 
These are the times when I need more medication that I have!  I wish I could make their life into a fairy tale where we all live happily ever after forever!