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) twin sister. She was first mentioned in a 1937 "Donald Duck" Sunday strip on October 17, 1937 in which she writes a letter explaining to Donald that she is sending her sons to stay with him. She appears as a child in "The Life and Times of Scrooge McDuck" in which she and Donald are wearing identical sailor suits. Both she and Donald are linked to Scrooge McDuck in equal measure, and yet Donald is always referred to as Scrooge's closest living relative, suggesting she has disappeared or died. In the Don Rosa comic 'Super Snooper Strikes Again', Huey, Dewey