Arthur Heffley

Arthur Heffley is Greg's great uncle. He cannot talk but instead grunts, whimpers and makes other noises, so it's possible he has a talking disorder. He is not married, making him one of Gammie Heffley's "Bachelors". He is almost bald and wears glasses. He almost always wears a tie, like Grandpa Heffley. He sleeps with Greg's brother, Rodrick Heffley when sleeping over at Gammie's house. Greg has speculated he may be attempting to communicate and as a result occasionally responds.