Cancer or Prancer?

We were sitting around the dinner table tonight when we started talking about our guests on Christmas Eve. We told the kids that Samantha's brother, Freddy, and her Aunt Sissy were coming to dinner, but that Sissy's husband Bob would not be coming because he recently died. Alex asked why he died and I said that he was very sick and had cancer. Then out of nowhere Alex finished my thought by saying, "Like Prancer and Dancer and Donner and Blitzen?" It was very funny, but sad at the same time.