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 universe with varying degrees of consistency. Disney comics are the primary medium for Donald Duck stories. Contributors include Americans Carl Barks, Ted Osborne, Don Rosa, Tony Strobl, Al Taliaferro, and William Van Horn, as well as Italians Giovan Battista Carpi, Marco Rota, and Romano Scarpa. Other media includes short films in the "Donald Duck" series, children's books such as Little Big Books and Little Golden Books, television series such as "DuckTales" (1987–1990), "Darkwing Duck" (1991–1992), and the "Ducktales" reboot (2017–), and video games such as "QuackShot" (1991), "" (2000), and "" (2013). "Donald Duck universe" is not an official Disney term,