Graham Bertran was one of Greg's cabinmates at Hardscrabble Farms during an annual (for one grade in Greg's school) one week trip Greg and his school went on. Little is know about Graham Bertran, because little is said about him. During the ropes obstacle course (Graham and his cabin mates had to get through an obstacle course with ropes tied to each other) when Graham and his cabin mates were struggling at it, Graham is seen falling to the ground, although it is never mentioned in the book, and only seen in an image. During mail call Graham got a big box. When Graham and his group went to there cabin Graham opened the box when there groups chaperone Mr. Jefferson was gone because the box contained snacks and junk food (that weren't allowed in camp and he didn't want to get himself busted