Nielsen Hayden genealogy
Family: Col. William Cogswell / Mercy Brewster (F25763)
m. 22 May 1791
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Male
Col. William Cogswell
Birth 9 Nov 1761 Preston, New London, Connecticut 
Death 23 Jun 1823 Connecticut Burial Pachaug Cemetery, Griswold, New London, Connecticut Marriage 22 May 1791 [1, 2] Preston, New London, Connecticut [1, 2] Father Nathaniel Cogswell | F25759 Group Sheet Mother Bridget Cleveland | F25759 Group Sheet
Female
Mercy Brewster
Birth 11 Jun 1765 Preston, New London, Connecticut Death 1 Nov 1832 Plainfield, Windham, Connecticut Burial Pachaug Cemetery, Griswold, New London, Connecticut Father Simon Brewster | F25764 Group Sheet Mother Anne Andrus | F25764 Group Sheet
Male
+ Dr. William Henry Cogswell
Birth 3 Dec 1798 Preston, New London, Connecticut Death 22 Nov 1876 Plainfield, Windham, Connecticut Burial Plainfield Cemetery, Plainfield, Windham, Connecticut Spouse Mary Lord Fuller | F25769 Marriage 3 Apr 1824 Connecticut Spouse Lucretia Anne Payne | F25771 Marriage 1829
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Sources - [S4434] Mayflower Families Through Five Generations: Volume 24, The Descendants of Elder William Brewster, Part 3, The Descendants of William Brewster Through His Children Patience, Fear, and Love, Generations 5 and 6 by Barbara Lambert Merrick. Edited by John Bradley Arthaud. Previewed by Peggy M. Baker. Plymouth, Massachusetts: General Society of Mayflower Descendants, 2019.
- [S8761] Find a Grave page for Col William Cogswell., date only.
- [S4434] Mayflower Families Through Five Generations: Volume 24, The Descendants of Elder William Brewster, Part 3, The Descendants of William Brewster Through His Children Patience, Fear, and Love, Generations 5 and 6 by Barbara Lambert Merrick. Edited by John Bradley Arthaud. Previewed by Peggy M. Baker. Plymouth, Massachusetts: General Society of Mayflower Descendants, 2019.