On December 16, 1869, Pierson was married to Susan Augusta Rhodes (1844–1929) in
Providence, Rhode Island. Together, they lived at 20
West 52nd Street • Marguerite "Daisy" Pierson (1870–1964), who married George Huntington Hull Jr. in 1910. • John Fred Pierson Jr. (1872–1951), who first married Suzanne Miles. They divorced in 1928 and he married Virginia (née Land) Blanchard, granddaughter of
Louisiana Supreme Court Justice
Thomas Land, in 1929. • James Rhodes Pierson (1873–1959), a Harvard graduate and president of the Ramapo Land Company and proprietor of the Pierson estate. • Harold Pierson (1875–1879), who died young. • Adeline Chandler Pierson (1876–1933), who married Edward Walker Scott Jr. Pierson worked up to four days before his death at age 93 in New York City on December 20, 1932, at which point he was the oldest general of the
Union Army in the civil war. ==See also==