An under-the-radar holiday?

Last weekend my daughter was curious why the manger displays were still up.  Christmas was over after all.  Is it wrong for me to tell her and her brother that on January 2 baby Jesus comes out of his creche* and if he sees his shadow then he hibernates until next Christmas;  if not, then he comes back at Easter**.

* “Creche” has not yet caught on with my kids.  To them it is a “baby Jesus setup.”

**  I didn’t get to complete this story.  I started but then my wife realized where it was going and shut me down.

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