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Burt's dad aka grandfather Burtonburger appeared in Kid Vs Kat Vs Christmas and in the episode Keep On Rockin' in season 2. He plays a role in fighting Kat, and he and Grandmother Burtonburger may be the first of the family after Coop to realize Kat's true nature and help him foil his plan.
After leaving on a balloon that episode he and Grandmother Burtonburger are not seen again for the season.