Gertrude Tannen

From Futurepedia, the Back to the Future Wiki

Gertrude Tannen was Biff Tannen's grandmother and presumably Buford "Mad Dog" Tannen's daughter-in-law. She lived with Biff at their house in Hill Valley.

She could be heard yelling to Biff the night of the Enchantment Under the Sea dance.

[edit] Appearances

• Back to the Future Part II (voice heard only)