Thora's mother

Thora's Mother (also known as Arthur, D.W., and Kate's Great-Grandmother) is the unnamed mother of Thora, the maternal grandmother of David and Loretta. She is Arthur, D.W., Kate, 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.

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