DuckTales (2017 TV series)
After not speaking to each other for ten years, Scrooge McDuck is reunited with his nephew Donald Duck after he asks Scrooge to babysit his three nephews Huey, Dewey, and Louie for the day. The presence of the newcomers rekindles Scrooge's sense of adventure, leading the group to go on many new treasure-hunting expeditions. The nephews and their new friend Webby seek the truth behind their uncles' strained relationship and the unexplained disappearance of Huey, Dewey, and Louie's mother and Donald's twin sister Della Duck.
Duck family (Disney)
Della Duck (called Dumbella in "Donald's Nephews"; born 1920) is the mother of Huey, Dewey, and Louie. She was first described as Donald's cousin, but was later Donald's 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 and Louie refer to themselves as 'orphaned' suggesting that their parents had died.