This story has a very nice arc.  You develop the theme with patience. The introduction of Nana makes sense.  Such a gift, such a tradition, rightfully comes from an elderly person.  This story would have been good for the ring prompt too :)

The resolution does not come magically, suddenly--although there is magic in it.  You lay the groundwork with the story about the grandfather.  The characters are believable.  

You do a good job here, @emreal.  Thank you for sharing this with us.