Manuel "Manny" Heffley is the youngest Heffley brother of Greg and Rodrick. He is a 3 to 6 year old boy. He is very annoying to Greg. He is spoiled to his parents, Frank and Susan Heffley. He is very curious. Manny's real birthday is December 28. He is potrayed by Connor and Owen Fielding and later by Dylan and Wyatt Walters.