Grandma Tracy

Grandma Tracy is a fictional character in the television series Thunderbirds. She was voiced by Christine Finn.

Little is known about Grandma Tracy's past, and her real name is never mentioned on screen with all the characters, even sometimes her son Jeff calling her "Grandma". As a young girl, her grandmother took her round London and she travelled on the London Underground, a fact that would prove useful later for International Rescue ("Vault Of Death"). She was married to a Kansas wheat farmer but became widowed some time before International Rescue begun and helped Jeff bring up his five sons after the untimely death of his wife. During International Rescue's early days she lived alone, near San Miguel, Colorado, however she began to miss feeling useful so decided to move to Tracy Island.

Shortly after winning the Parola Sands Race, her Grandson Alan Tracy picks her up so she can move to Tracy Island. Unfortunately, a racing competitor of Alan's takes revenge and Grandma finds herself having to sit still on a bridge spanning the San Miguel River with Alan due to a bomb that has been placed under the bridge to exact revenge. If either of them moved, the bomb would detonate. She and Alan are rescued by her grandsons, allowing Grandma to see first hand the work that her family did, and she moved into the Tracy home ("Move And You're Dead").