Daisy Duck Once Upon a Christmas", "Mickey's Twice Upon a Christmas", and "". According to the unofficial timeline of Don Rosa, Daisy was born in 1920. According to Rosa, Daisy is the sister of Donald's brother-in-law – Daisy's brother had married Donald's twin sister, Della Duck, and together, the two became the parents of Huey, Dewey, and Louie Duck. This is his explanation of why the triplets tend to call her "Aunt Daisy" while no such courtesy is given to Gladstone Gander for example. Don Rosa has said that he considers Donald and Daisy to be nonrelated and that Duck simply is
Donald Duck Disorder; said theory mentioned can also be found on YouTube. In effect, much like Bugs Bunny cartoons from Warner Bros. the Disney artists had reversed the classic screwball scenario perfected by Walter Lantz and others in which the main character is the "instigator" of these harassing behaviors, rather than the butt of them. The short 'Clown of the Jungle' (1947) very much feels like either a Daffy Duck or a Woody Woodpecker cartoon. The post-war Donald also starred in educational films, such as "Donald in Mathmagic Land" and "How to Have an Accident at Work" (both 1959), and made cameos