Fahnestock married Margaret A. McKinley (1835–1898), a daughter of Isaac G. McKinley, also of Harrisburg. Together, they were the parents of five boys and a girl. Margaret died on December 22, 1898. Fahnestock died on June 4, 1914, at his home,
457 Madison Avenue in Manhattan (which was owned by
Random House in 1968 and today is site to
Municipal Art Society), after "two weeks' illness from
erysipelas and a complication of diseases". He was buried at
Woodlawn Cemetery in the
Bronx.
Descendants and legacy The Fahnestocks were parents of six offspring: • William F. Fahnestock (1857–1936), who married Julia Strong Goetchius. He built
Bois Doré in
Newport, Rhode Island. • Gibson Fahnestock (1859–1917), who married Carolyn Snowden Andrews, a daughter of
Confederate commander
Richard Snowden Andrews. • Harris Fahnestock (1869–1939), who married Mabel Estelle Metcalf (1870–1930) in 1896. After her death, he married Georgette (née Gérard-Varet) Hyde (1897–1968), daughter of Louis Gérard-Varet (head of the
University of Rennes), in 1937. • Helen Fahnestock (1872–1955), who married Dr. Clarence Gordon Campbell (1868–1956) in 1896. They divorced in 1922 and she married John Hubbard (1870–1933) in 1928. • Clarence Fahnestock (1873–1918), who married
Marguerite Sawyer, a member of the
Lodge family of Boston, in 1906. His estate in
Cold Spring, known as Clear Lake, was considered one of the finest in America. • Ernest Fahnestock (1876–1937), who married Georgette Henriette (née DeGrove) Perry (1873–1957), the widow of merchant Edward Perry, in 1905. His estate was valued at $3,613,625 in 1941. In 1929 Dr. Ernest Fahnestock, donated about as a memorial to his brother Clarence, who died in the post-
World War I Influenza epidemic of 1918 while treating patients with the disease. Today, the park is known as the
Clarence Fahnestock State Park in Putnam and Dutchess Counties in New York. Harris Fahnestock's grandson
William Fahnestock was at age 23 the youngest member of the
New York Stock Exchange and later senior partner of Fahnestock & Co. William's second wife, Mrs. Eppes (née Hawes) Moore, was a daughter of
U.S. Senator from Missouri,
Harry B. Hawes. Through his son Harris, Harris C. Fahnestock was a grandfather of Ruth Fahnestock (1908–1974), who married A. Coster Schermerhorn in 1926. They divorced (he married and divorced romance novelist
Ursula Parrott) and in 1937, Ruth married Count
Alfred de Marigny. They also divorced and Marigny married Nancy Oakes in 1942. In 1943, he was arrested, tried, and acquitted of murdering his father-in-law
Sir Harry Oakes. ==References==