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 and Karp created an even larger cast of characters for Donald's world. He got a new St. Bernard named Bolivar, and his family grew to include cousin Gus Goose and grandmother Elvira Coot. Donald's new rival girlfriends were Donna and Daisy Duck. Taliaferro also gave Donald his very own automobile, a 1934 Belchfire Runabout, in a 1938 story, which is often nicknamed by Donald's "313" car plate in the comic incarnation of Donald's world. In 1942, Western Publishing began creating original comic-book stories about Donald and other Disney characters. Bob Karp worked on the earliest of these, a story called