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").
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