Benjy Heffley

Benjamin "Benjy" Heffley is Greg's cousin. He wears a diaper and has postruded hair like Greg and Manny. He seems to be around 2 or 3 years old. According to Greg, at one time he could only say 3 words; no, shut, and up. Also, according to his parents, he can also fully read, which Greg highly doubts. He also appears in the Do-It-Yourself Book in a question.