Serpentina Mongfish DuMedd is (or more likely was) the sister of Lucrezia Mongfish, and mother of Theopholous DuMedd. Apparently she met her husband when he raided the Mongfish estate and destroyed Lucrezia's lab, escaping with Serpentina and leaving Lucrezia behind . It appears that the two sisters never really got along, and Theo takes after his father, who Lucrezia really didn't like. Too bad for him. Serpentina and her husband assisted the Baron with his Pax Romana, later dying while fighting against a large band of sky pirates, according to Agatha H and the Airship City.