WOW, our stories could almost match. My boys are 7 and 5. About one year before my initial diagnosis their great grandmother also died of cancer. I do not believe I ever told the boys that she had cancer, but did tell them that she was sick. My 7 year old is doing better, but has been internalizing everything. My 5 year old just loves life, and not much ever phases him.
Eric, I tried to send you a PM, but it said you were not accepting them.