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In Don Rosa's Donald Duck family tree (first published in 1993), he is included as a member of the Coot Kin and more specifically as son of Casey Coot and his wife Gretchen Grebe, which makes him a nephew of Grandma Duck, a brother of Donald's Aunt Fanny, a first cousin of Quackmore Duck, a first cousin once removed of Donald Duck and an uncle of Gus Goose.
- In the original German translation of "Webfooted Wrangler", Cuthbert is Donald's uncle instead of his cousin.