This is a very powerful story.  Thanks for sharing.

I liked the slow build here.  The tension within the family was palpable.  And using Oscar to voice his and the reader's confusion about the holiday worked very well.  The reveal was bittersweet -- bitter because of the sad truth, and sweet because of how Kevin handled the situation.  Gail and Judy had their own difficulties play out rather dramatically, but it was Oscar and Kevin who stuck with me.  I enjoyed what you did with the prompt; thank you for sharing.

Trust a small child to bring up the thing that no one wants to talk about.  I liked the way you formed the characters.  I have an impression of what their lives were like growing up just by watching them handle this situation.

Beautifully done.  At first, I thought it was Judy who was dying.  You portrayed Kevin's acceptance and Judy's anger/despair perfectly. So often the child is quite serene while the parents go to pieces around him.