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.
Ludwig Von Drake
In the "Wonderful World of Color" episode "Kids is Kids", Ludwig states that he is a bachelor. In the "Wonderful World of Color" episode "The Hunting Instinct", Walt Disney states Ludwig is Donald Duck's father's brother.