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, 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. It is unknown where she grew up, who her parents were, and wheather or not she had any siblings.

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. Her husband is probably deceased due to the fact he was not at the family reunion so there for she is widowed.

Episode appearances

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