<Ul> <Li> Jaeden Lieberher as Henry Carpenter, the title character and Susan's older son . </Li> <Li> Jacob Tremblay as Peter Carpenter, Henry's brother and Susan's younger son </Li> <Li> Naomi Watts as Susan Carpenter, the mother of Henry and Peter </Li> <Li> Dean Norris as Glenn Sickleman, the police commissioner and Christina's abusive stepfather </Li> <Li> Maddie Ziegler as Christina Sickleman, Glenn's stepdaughter </Li> <Li> Sarah Silverman as Sheila, a waitress and Susan's best friend </Li> <Li> Lee Pace as David Daniels, a neurosurgeon who operates on Henry </Li> <Li> Bobby Moynihan as John, Susan's and Sheila's boss at the diner </Li> <Li> Tonya Pinkins as Janice Wilder, the school principal </Li> <Li> Geraldine Hughes as Mrs. Evans, Henry's and Christina's teacher </Li> <Li> Jackson Nicoll as Morris, a boy who bullies Peter </Li> </Ul> <Li> Jaeden Lieberher as Henry Carpenter, the title character and Susan's older son . </Li> <Li> Jacob Tremblay as Peter Carpenter, Henry's brother and Susan's younger son </Li> <Li> Naomi Watts as Susan Carpenter, the mother of Henry and Peter </Li>

Who plays peter from the book of henry