Aunt Gretchen

Aunt Gretchen (last name unknown) is the youngest sister of Susan. She has two twin boys, Malvin and Malcolm, who are so out of control that she used to keep them on child leashes. She has a lot of pets, and Greg explains that their house was like a zoo when she visited and brought her pets with her.

Appearances
""
 * Diary of a Wimpy Kid: Hard Luck (First and only appearance)