Donald Duck universe
Donald Duck and his maternal uncle Scrooge McDuck received nearly equal exposure in comics. Other primary characters include Donald's three young nephews Huey, Dewey, and Louie, and girlfriend Daisy Duck.
Duck family (Disney)
In his second appearance in "Smarter Than The Toughies" (2004) by Lars Jensen and Daniel Branca, Whitewater is the nephew of Scrooge McDuck's cousin Douglas, making him Donald's second cousin.