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  ===Writing===
  The episode was written by series co-creators David Benioff and D. B. Weiss.
  "Second Sons" was written by the show creators and executive producers David Benioff and D. B. Weiss, based on material from George R. R. Martin's novel ''A Storm of Swords''. The episode adapts parts of the book's chapters 19, 29, 37, 43, 47 and 48 (Samwell I, Sansa III, Davos IV, Daenerys IV, Samwell III and Arya IX).