What is the name of Donald Duck’s sister who is the mother of his nephews? Her name is Della Duck.
Della is Donald’s younger twin sister and the mother of Huey, Dewey, and Louie. The nephews were sent to stay with Donald after a 1937 comic-strip letter from their mother, establishing her family role before she became a fully developed on-screen character.
Her name has varied across Disney history. In the 1938 short “Donald’s Nephews,” she is called “Dumbella,” while Carl Barks’s 1990 family tree used “Thelma.” Don Rosa’s 1993 family tree popularized the name Della, which became the standard modern identity.
Della received a major animated role in the 2017 DuckTales reboot. That version portrays her as a fearless pilot and space explorer who becomes stranded on the Moon, later returning to her family with a prosthetic leg. She is therefore much more than a background family reference.