 On April 23, 1899, Chapman married Elizabeth Astor Winthrop Chanler (1866–1937), second daughter of John Winthrop Chanler and Margaret Astor Ward of the Astor family, and sister of soldier and explorer William A. Chanler.Chapman died on November 4, 1933 in Poughkeepsie, New York.His funeral, held at Christ Church on 71st Street, west of Broadway in New York City, was attended by hundreds.