Malvin and Malcolm

Malvin & Malcolm are the twin sons of Aunt Gretchen and cousins to Greg, Rodrick and Manny. They are very wild and her mother kept them on child-leashes when they were small.

Appearance
Their only appearance so far is in Hard Luck, where they play a fairly significant role during Greg's spring break. He mentions how they did dumb stuff the previous year and caused a lot of stress for the Heffley Family, like when Malvin got sent to the ER for getting hit while playing catch with a rock. Then Malcolm shaved using Frank's razor and nobody could do anything about it. But in the current events, Malvin and Malcolm only stayed 2 days because Malcolm called 911 after the Heffleys ran out of ketchup, so Frank told them they had to leave.