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Step Brothers is a 2008 American comedy film directed by Adam McKay and written by Will Ferrell and Adam McKay. The film stars Ferrell, John C. Reilly, Mary Steenburgen, Richard Jenkins, and Kathryn Hahn. The film follows Brennan Huff (Ferrell) and Dale Doback (Reilly), two forty-year-old men who are forced to live together after their fathers (Jenkins and Steenburgen) marry.