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)
Don Rosa's Duck Family Tree states that Whitewater's real name is Abner, and "Whitewater" is a nickname. He is also shown to be a son of Eider Duck and Lulubelle Loon and Fethry Duck's brother, making him Donald's first cousin.