Caitlin Walker is the twelve-year-old illegitimate child of Barry Walker and his mistress. She was born when Bryce, her elder paternal half-brother, was just six years old. For twelve long years, she has been listed in the divorce papers Mr. Walker filed against his wife Nora, listing his illegitimate daughter as a dependent for the Walker inheritance and a replacement for Bryce in Barry's eyes.She never made any appearances, but is mentioned in flashbacks and by Ani and Clay in the present of "You Can Tell the Heart of a Man by How He Grieves".

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