Thora's mother

Thora's Mother (also known as Arthur, D.W., and Kate's Great-Grandmother) is the unnamed mother of Thora and the maternal grandmother of David and Loretta. She is Arthur, D.W., Kate, Cousin George, Monique, Ricky, and Unknown Female Aardvark (Number 2)'s great-grandmother.

Past life
In "Clarissa is Cracked," she is shown as a young mother from Thora's childhood.

Current life
In "Arthur's Cousin Catastrophe," she is shown as a present elderly woman at the family reunion, and later wins the egg and spoon race.

Episode appearances

 * Arthur
 * 10902 Arthur's Cousin Catastrophe
 * 31202 Clarissa is Cracked (flashback)