Mrs McDuck was a female anthropomorphic coot, possibly with some duck blood.
Description[]
According to one account, the mother of Seafoam McDuck — Scrooge's great-great-great-grandmother in the paternal line — was none other than one of the daughters of Duckburg founder Cornelius Coot, although, absent offscreen time-travel shenanigans, this can only be chronologically possible if one subscribes to the theory that Cornelius lived in the 17th century, rather than late 18th and early 19th as is usually accepted.
Behind the scenes[]
Mrs McDuck appears in the 1999 Stammbaum der Ducks, a German version of the Duck Family Tree.