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
Duck family (Disney) is the wife of Casey Coot, the mother of Cuthbert and Fanny Coot, and the maternal grandmother of Gus Goose. Fanny Coot is the mother of Donald's cousin Gus Goose and she was first mentioned in the Donald Duck comic strip of May 9, 1938 by Bob Karp & Al Taliaferro where Gus first appeared. But Gus's mother's surname wasn't revealed in this comic strip, where she identifies herself in a letter to Donald as "Aunt Fanny". So she was originally sister of one of Donald's parents. In Don Rosa's Duck Family Tree she is featured as a daughter of