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I made a Pigeon-rat!
~ Hugo when he shows Bart a creation of his.
So I have two brothers?
~ Lisa saying that Hugo is one of her brothers besides Bart.
Hugo Simpson II is the secondary antagonist of Treehouse of Horror VII. When he was born he was a conjoined-twin and later he was separated from his twin brother Bart a short time after birth; Hugo was supposedly the baby who tried to eat Bart's arm. His parents and Dr. Hibbert found out that his scar was on the wrong side and that Hugo was the good baby, and that Bart had tried eating his arm, leading him and Bart switching places.
As a newborn child with Bart (Hugo is on the left, NOT the right)
His Great-Great-Great Uncle Hugo Simpson I, who he was named after.