Webthis is the true story of adam mckay, will ferrell, and john c. Webwell, that was until adam mckay's unruly step brothers, played by will ferrell and john c. Reilly came in with full chaotic force. And it turns out that our. Reilly in a ridiculously funny tale of two immature and. Directed by adam mckay. With will ferrell, john c. Reilly, mary steenburgen, richard jenkins. Webferrell and reilly are hilarious in their roles as rambunctious children stuck in adult bodies, whose outrageous behavior can’t be controlled by their despairing parents. Webthe new book shares the previously untold story of the iconic singer’s christian faith, its influence on his music, films, and relationships, as well as on his family. Webthat became the foundation for 2008’s “ step brothers,” mckay’s absurdist comedy that sees ferrell and reilly as brennan huff and dale doback, two infantilized. Weblearn the secrets behind the laughter. Here are some facts about the making of step brothers that you won't believe.