Okay, I’ll confess: Until this very day, I had never heard of “Dirty” Dingus McDuck, Sir Quackly McDuck, or Sir Eider McDuck, let alone noticing that Sir Eider looks strangely like a certain Warner Brothers character, But Mr Broke Hoedown was kind enough to forward me a link to Donald Duck’s Family Tree, and now not only am I clued in about their existence, but also about their specific relationships to our well-loved Donald.
Tons more detail on the family tree, including several translations and a publication history, are available here.
Broke Hoedown 
That is awesome – I’ve never seen Donald’s family tree before…what a fantastic find!
Ducks and geese marrying and reproducing? It’s a scandal! I bet they live in that Massachusettes! They are making a mockery out of the institution of marriage! 😉