Donald's Nephews
Donald's Nephews (1938) is a Donald Duck animated cartoon which features Donald being visited by his three nephews, Huey, Dewey, and Louie. This cartoon is Huey, Dewey, and Louie's very first appearance in animation. The short, and the three nephews, was the idea of Al Taliaferro, the artist for the "Silly Symphonies" comic strip, which featured Donald Duck. The Walt Disney Productions Story Dept. on February 5, 1937, sent Taliaferro a memo recognizing him as the source of the idea for the planned short. Taliaferro subsequently introduced the nephews in his comic strip, which by this time had been renamed "Donald Duck", on Sunday, October 17, 1937, beating the theatrical release of "Donald's Nephews" by almost six months.
Donald Duck
Having several full lives to live doesn't hamper Donald's ability to live adventures on his own: he still lives adventures with his uncle Scrooge and his nephews (often acting as a reluctant bumbler, a ballast to the enthusiasm of his nephews and the wanderlust of his uncle), and he lived a star-crossed love story with a princess from another planet, "Reginella". Despite Reginella leaving a deep trace in Donald's heart, he is still depicted as extremely faithful to Daisy, with a small hiccup deriving by Daisy Duck having a secret identity on her own ("Paperinika"), with Paperinik and Paperinika, both unaware of their secret identities, cultivating a permanent status of belligerent tension.