<Li> Steve Zahn as Frank Heffley, Greg's father </Li> <Li> Robert Capron as Rowley Jefferson, Greg's best friend </Li> <Li> Devon Bostick as Rodrick Heffley, Greg's brother </Li> <Li> Peyton List as Holly Hills, Greg's love interest, friend and eventual girlfriend </Li>

Who plays rodrick in diary of a wimpy kid dog days