Benjy Heffley

Benji is Manny ,Greg, and Rodrick`s cousin. He wears a diaper and has only a single piece of hair. He seems to be around 2 or 3 years old. According to Greg, at one time he could only say 2 words: "NO!" and "SHUT UP!" Also, according to his parents, he can also fully read which Greg highly doubts.