Ezra (b 6 Mar 1775 Chesterfield Ma) was the son of Samuel 5 & Jane Hayden. His line: Ezra 6 (Saml, Daniel, John, Increase, John 1). Ezra and his brother, Cyrus (b 1 May 1788) along with father Samuel were counted at Worcester, Otsego Co., NY, in the 1800 USC. In 1810, Ezra and Cyrus were counted at Greene, Chenango Co., NY. Ezra was counted in 1840 at Bingham, Potter co., PA. I don't know where Cyrus was after 1810. Ezra, age 76, was counted in 1850 at Great Valley, Catt., NY, residing next to son Hiram, age 44. The "S.K. Niles" on the same page of the census is Squire Niles, probably a younger son of Ezra. (The 1840 USC for PA shows two sons at home for Ezra of Squire's age).
Stan Niles' web site www.nilesfamily.com for burials at the Willoughby Cem Great Valley has:
Hiram Niles, 25 Oct 1805-12 Jul 1859 Lovinia T Niles, 24 Apr 1813-5 Jun 1865, wife of Hiram Harriet C. Niles, 1825-23 Dec 1858 Alice O. Niles, daughter of Squire & Harriet Niles
The "Syaris Niles" of the 1860 census is probably a bad spelling of Squire.