Frederick was the son of John Bennett of Bridgewarter, Grafton County, New Hampshire and Elizabeth Connor Bennett of Massachusetts. Elizabeth and John were married on 17 November 1796 in Gilead, Oxford County, Maine. Elizabeth and John had fourteen children. They were: Mary Bennett was born on 09 May 1797; Frederick Bennett was born on 15 July 1802; Nancy Bennett was born on 20 June 1801; John Bennett was born on 20 February 1803; Hannah Bennett was born on 15 February 1805; Betty Bennett was born on 12 February 1807; Hulday Bennett was born on 05 December 1808; David Bennett was born on 10 October 1810; Lucy Bennett was born on 19 September 1812; Sarah Bennett was born on 27 April 1814; Peter Bennett was born on 17 January 1816; Julia Bennett was born on 14 March 1818; Gilman M. Bennett was born on 10 March 1820; and Ransom Bennett was born on 10 August 1821. All the children were born in Gilead, Oxford County, Maine.

Frederick married Mary Polly Scribner on 23 November 1826 in Gilead, Oxford County, Maine. Mary and Frederick had twelve children. They were: John P. Bennett was born on 15 June 1827 in Gilead, Oxford County, Maine; Nancy C. Bennett was born on 23 August 1829 in Gilead, Oxford County, Maine; Ann Elizabeth Bennett was born on 09 August 1831 in Gilead, Oxford County, Maine; Nathaniel Kimball Bennett (# 43375480) was born on 04 August 1834 in Newry, Oxford County, Maine; Peter Q. Bennett was born in June 1836 in Newry, Oxford County, Maine; Julia L. Bennett was born on 28 April 1839 in Newry, Oxford County, Maine; Adna Bennett was born in 1840 in Newry, Oxford County, Maine; Mary A. Bennett was born on 13 December 1842 in Newry, Oxford County, Maine; Thomas J. Bennett was born on 04 July 1844 in Newry, Oxford County, Maine; Endora Eliza Bennett was born about 1847 in Wilsons Mills, Oxford County, Maine; Dora Cora Bennett was born on 30 April 1848 in Newry, Oxford County, Maine; and Lucinda W. Bennett was born on 20 November 1850 in Newry, Oxford County, Maine.