Thora's mother


 * name = Aunt Mary
 * image = Arthur's Great Grandmother.PNG|Thora's Mother]]
 * role = Double-Appearance Character
 * gender = Female
 * animal = Aardvark
 * actor = Sonja Ball (young woman)
 * double1 = Arthur's Cousin Catastrophe
 * double2 = Clarissa is Cracked (flashback)
 * family = Thora Read (daughter) David Read (grandson) Loretta (granddaughter) Arthur Read (great-grandson) Monique (great-granddaughter) Ricky (great-grandson) D.W. Read (great-granddaughter) Tiffany (great-granddaughter) Kate Read (great-granddaughter) Sons
 * episodes = 2}}

Thora's Mother (also known as Arthur, D.W., and Kate's Great-Grandmother) is the unnamed mother of Thora, David and Loretta's maternal grandmother, and Arthur, D.W., Kate, Monique, Ricky, and Tiffany's great-grandmother. In Clarissa is Cracked, she is shown as a young mother from Thora's childhood, and in Arthur's Cousin Catastrophe, she is shown as a present elderly woman at the family reunion, and later wins the egg race there.