Humperdink Duck

Humperdink Duck was the husband of Elvira Coot and grandfather of Donald Duck. He worked as a farmer in Duckburg. He had three children with his wife: Quackmore, Daphne and Eider Duck. Humperdink Duck had relevant comic appearances in two stories by Don Rosa. "The Invader of Fort Duckburg", a chapter of the saga The Life and Times of Scrooge McDuck, and "The Sign of the Triple Distelfink". He was known as "Pa Duck" (later known as "Grandpa Duck").

Unlike his wife Elvira, whose parents and even a brother were identified by Don Rosa, who also decided she's the granddaughter of nothing less than the founder of Duckburg, Cornelius Coot, Humperdink's past before having a family with Grandma was never showed in the comics. According to Don Rosa, "the Duck family came from the British Isles, probably England".

In the story "The Good Old Daze" by Tony Strobl, one of the most beloved duck masters of all-time, Grandpa Duck (an older Humperdink) appears in flashback taking care of little Donald along with Grandma. He's portrayed as a dedicated but rigorous grandfather. Grandpa's real name wasn't revealed in this story, but in an untitled one from 1951, where an old lover of Grandma called Humperdink has a cameo appearance. Don Rosa considered that this character became Donald's grandfather. In this same story, Grandma remembers an occasion where she and Humperdink heard one of her favorite songs. She says to herself, "I remember the band played that for Humperdink and me at the Fish Peddler's Picnic in 1905!". Besides, Grandma finds the ruined coat Humperdink had used to let her not step on a mud puddle and some romantic letters addressed to her written by Humperdink. Then she remembers some sweet names Humperdink used to refer to her in those letters.

Humperdink appeared as "Grandpa Duck" in two comic stories previously mentioned. "The Good Old Daze" by Strobl and "The Sign Of The Triple Distelfink" by Rosa, but Strobl drew him with a quite long beard and some hair, while Rosa has drawn him with a short one and a full head of hair. In a comic story first published in 2013 Grandpa Duck (Strobl's version) appears in a flashback scene which is told by his wife Grandma Duck. This story is called "The Good Neighbors" by Lars Jensen and Flemming Andersen and makes part of the comic sub-series Tamers of Nonhuman Threats.