Gretchin Grebe

Gretchen Grebe is a fictional character of the Scrooge McDuck universe created by Keno Don Rosa for The Walt Disney Company. Though she hasn't appeared in any actual stories, Don added her to his family tree of his characters. She is featured as the wife of Casey Coot, mother of Cuthbert Coot and Fanny Coot snd grandmother of Gus Goose. It has also been suggested that she is the grandmother of Kildare Coot.