Josh Brolin and Miles Teller have joined the cast of Sean Penn's Flag Day. The film will also see Penn star along with his children -- daughter Dylan and son Hopper. The film is based on Jennifer Vogel's 2005 memoir, titled Flim-Flam Man The True Story of My Father's Counterfeit LifeThe book follows a woman who has to come to terms with her perceptions of her criminal father, who is a bank robber and career counterfeiter that evaded arrest for six months. Tony-winning playwright Jez Butterworth is writing the screenplay. Norbert Leo Butz, Dale Dickey, Eddie Marsan, Bailey Noble, and Katheryn Winnick are also part of the cast. Wonderful Films, Rahway Road, New Element Films and Clyde Is Hungry Films are backing the project, with William Horberg, Jon Kilik and Fernando Sulichin attached to produce.