Katharine is the daughter of Copley Amory [1866-1960] and Mary Forbes Russell Amory [1870-1961], and a descendant of the artist John Singleton Copley. She is one of five children: Copley Jr. [d.1964], Henry Russell [d.1962], Walter, and Elizabeth.
Linzee, John William. The Linzee Family of Great Briain and the United States of America. 2 vols. Boston, 1917: 2:796.