Della Duck, occasionally referred to as Dumbella Duck or Thelma Duck, is Donald Duck's twin sister and the daughter of Hortense McDuck and Quackmore Duck. She is also the mother of Huey, Dewey and Louie, Donald's triplet nephews. Della has rarely appeared in many stories, so information about her is largely unknown. According to the Eiser Award-winning comic book series The Life and Times of Scrooge McDuck, Della and Donald are twins.
