Thora's mother

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.

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

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 race there.