← Back to filmFilm · CastFull castMy Grandpa DetectiveOn screenCast4 credited performersArtwork unavailableStephen HardyRobert Whitmore 3rd (Bobby)Garry NationRobert Whitmore 1st (Grandpa)Artwork unavailableGlenda WarkentinSassyArtwork unavailableStephen EllerbeckBob (Robert Whitmore II)
