From Barnum, Mary Pierpont, and Arthur Edwin Boardman. Pierpont Genealogy and Connecting Lines Particularly Rev. John Pierpont of Hollis Street Church, Boston, Massachusetts. Boston: [s.n.], 1928, page 22:
Mary Augusta Pierpont, daughter of James Pierpont and Millicent Cowee, born at Troy, Rensselaer County, NY, August 20, 1847, married at Troy, NY October 12, 1870, to Theodore Frelinghuysen Barnum, son of Milo Barnum and Rebecca Boughton, born at Dresden, Yates County, NY, October 12, 1844, died at Troy, NY, August 31, 1918.
a) Louise, born at Troy, NY, December 19, 1872 died July 1, 1873
b) Theodore Pierpont Barnum, born Troy, NY March 26, 1874
c) Millicent Cowee Barnum, born Troy, NY October 26, 1877, died July 8, 1883
d) John Pierpont Barnum, born Troy, NY July 14, 1884
e) David Farwell Barnum, born Troy, NY November 9, 1886
An interesting note about Mary Augusta (Pierpont) Barnum is that her father wrote the Christmas carol "Jingle Bells".
From the New York Times, March 26, 1937: Barnum--at the Samaritan Hospital, Troy, NY, March 25, 1937, Mary Pierpont, wife of the late T. F. Barnum; mother of Theodore P., John P., and David F. Interment Oakwood Cemetery.