Question: who played peter in the book of henry
Answer: Jacob Tremblay as Peter Carpenter , Henry 's brother and Susan 's younger son Sarah Silverman as Sheila , a waitress and Susan 's best friend Dean Norris as Glenn Sickleman , the police commissioner and Christina 's abusive stepfather Lee Pace as David Daniels , a neurosurgeon who operates on Henry Maddie Ziegler as Christina Sickleman , Glenn 's stepdaughter Tonya Pinkins as Janice Wilder , the school principal Bobby Moynihan as John , Susan 's and Sheila 's boss at the diner Geraldine Hughes as Mrs.