Donald’s family is composed of three branches. The McDuck Clan, Coot kin and the Duck family.
Coots are smaller birds that often get mistaken for ducks and while Coot can be used as a last name like how Duck or Mouse are common last names in the duckverse (like Johnson or Smith etc) I doubt that Barks and Rosa went out of their way to give them a last name without it having some biological meaning as well.
Donald’s dad, Quackmore Duck, is the son of Elvira Coot and Humperdink Duck. Now, unfortunately we don’t know much about Humperdink’s parents but we’re given enough tools at our disposal to figure enough out.
Donald’s mother is Hortense McDuck, a fiery duck from Scotland. As far as I can tell, duck is all she has.
So that’s it right?? Donald is part duck part coot??
NOPE
THERE’S SOMETHING ELSE
DONALD’S PART GOOSE AS WELL
The guy who looks high at the bottom left corner of the picture there?? That’s Gus Goose. He’s a semi-distant cousin of Donald’s related to him from his father.
Now it’s implied from the family tree that the goose part for Gus came from Luke Goose which is fine and dandy and it could very well have been from him. But again, it doesn’t have to be the only source of goose in his family. (and it already isn’t considering Gladstone Gander canonically being half goose half duck)
Humperdink’s parents are unknown right?? Who’s to say he isn’t part goose as well? Maybe he got it from his dad or mom who knows they’re not in the tree. And if he’s part goose part duck, then Quackmore is goose-duck-coot mixed.
Going by all of this, we can say that Donald Duck is 2/4ths Duck, ¼th Coot and ¼th Goose.
