Mitchel lives in Texas with his Mom and Dad; his two brothers, Mason and Marc; and his dog Stitch. Mitchel was busy for two years doing lots of commercials and a couple of films, and print jobs. Mitchel's breakthrough came in September 2002, when New Line Cinema needed two little boys to play the nephews of Robert Duvall and Michael Caine in Secondhand Lions (2003) Mitchel was fortunate enough to not only get the part but also to play opposite his own real-life brother Marc Musso. Since then, Mitchel starred in a Pilot for Fox called "Hidden Howie," where he plays Howie Mandel's son. He will also be seen in the fifth episode of "Oliver Beene" in February 2004. The episode is called "Soup to Nuts" and Mitchel plays One Nad. Mitchel starred in the pilot of "Avatar: The Last Airbender" (2005) and two commercials for Sony Playstation, playing the part of Billy.