In 1886, Thaw was married to Elma Ellsworth Dows (1861–1931), a daughter of Stephen Leland Dows and Henrietta (née Safely) Dows of
Cedar Rapids, Iowa. They spent much of their time in Pittsburgh, but maintained a residence in New York at 854 Fifth Avenue (which was owned by Gov.
Robert Livingston Beeckman) and, later, at
640 Park Avenue. • Benjamin Thaw Jr. (1888–1937), the first secretary of the American Embassy in London who married Laura Consuelo Morgan, a daughter of diplomat
Harry Hays Morgan and sister to
Gloria Morgan Vanderbilt,
Thelma Furness, Viscountess Furness, and
Harry Hays Morgan Jr. • Henrietta Thaw (1891–1942), who married Lawrence Slade, an official of the New York Trust Company in Paris. •
William Thaw II (1893–1934), who flew with the
Lafayette Escadrille, who married Marjorie Everts. • Alexander Blair Thaw (1898–1918), who was killed while serving in the American flying forces in August 1918. His wife died at their home in
Paris in November 1931. A month after his wife's death, he sold much of the art collection she had acquired over many years. Thaw died at his home in Morewood Place in Pittsburgh on August 20, 1933. He was buried in Allegheny Cemetery. ==References==