A school assignment leads Dinky to question why she's never met her mother's parents.The truth of the matter being that Derpy hasn't spoken to them since before she was born.
Twilight knows something's up when Pinkie asks her for help with writing. But what harm could it do? Writing always was one of her favourite subjects...
A few generations hence, Spike is visited by his great-grandson, Uvarovite, and his fiancee, Dusty, and tells the story of how he won his wings and the heart of Uvarovite's great-grandmother, Rarity.