On October 17, 1889, he married Caroline Ames Ladd (September 3, 1861, Portland OR - June 12, 1946, Glen Cove), the daughter of
William S. Ladd and Caroline Elliott. They had three children: • Charles Pratt (1892-1956), who served as President of the Board of Pratt Institute from 1937-1953. • Mary Caroline Pratt (1895-1980), who married attorney
Christian Herter. He later served as Governor of Massachusetts (1953-1956), and Secretary of State (1959-1961). • Helen Ladd Pratt (1899-1972), whose first marriage was to Richard Stockton Emmet. In 1945, she married J. Holladay Philbin. , The Frederic Pratt house at their Glen Cove estate, Long Island Pratt commissioned
Charles A. Platt to design the family county estate, known as "
Poplar Hill", in
Glen Cove, on the North Shore of Long Island. Since 1971 it has been owned and operated by Glengariff Healthcare Center. Pratt commissioned a family home at 229 Clinton Avenue, Brooklyn, designed by noted New York architect
Henry F. Kilburn. It was originally known as the "Frederic B. Pratt House" (it is now known as the
Caroline Ladd Pratt House). It was completed in 1898 in a neo-Georgian style. The family donated the property to the
Pratt Institute. Pratt died May 3, 1945, at his family home in Glen Cove, aged 81, of a heart ailment. ==References==