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Burt's mom aka
grandmother Burtonburger appeared with grandfather Burtonburger in season 1 during Kid vs Kat vs Christmas and in the episode Keep On Rockin' in season 2, where she plays a role in fighting Kat.
She may ne being the first family member after Coop to discover the truth about Kat.
After leaving on a balloon that episode she is not seen again for the season.
The present she gives the family may be the best.
During Who's Haunting Who? when Millie suggests making taffy to calm him down, Burt comments there is "nothing like Grandma Burtonburger's old-fashioned all-natural fruit taffy".