|In 288 AC
A Storm of Swords
As part of the pact between Lord Tywin Lannister and Lord Walder Frey concerning the betrayal of Robb Stark in the Red Wedding, Joy is to wed a natural son of Walder from House Frey once she is older.
A Feast for Crows
After the siege of Riverrun, Lady Sybell Spicer mentions to Ser Jaime Lannister that his late father, Tywin, had promised a bride from Casterly Rock for her eldest son, Ser Raynald Westerling. Because Sybell mentions "joy", Jaime thinks Tywin intended for Joy Hill to marry Raynald. Sybell is angered at the idea of her son marrying a bastard.
Sybell: Your lord father said that Raynald should have joy of him, if all went as we hoped.
Jaime: Joy is my late uncle Gerion's natural daughter. A betrothal can be arranged, if that is your wish, but any marriage will need to wait. Joy was nine or ten when last I saw her.Jaime: No more than I want Joy to marry the son of some scheming turncloak bitch. She deserves better.
Sybell: His natural daughter? You want a Westerling to wed a bastard?