Caroline Clausen Urban was Hahn's half sister and recipient of his small estate. She was born in New York on May 6, 1837 and lived in St. Louis, Mo., where she was raised by her half sister, Julia. Her husband, Dominique Urban, was from Alsace-Lorraine. They were married June 19, 1856 in St. Louis. He became a major in the second Missouri light artillery. By 1860, he was listed as a St. Louis assessor in the St. Louis directory. They moved to New Orleans after the Civil War.