Polly Yarnell was the daugher of Mordecai Yarnell b. 17 Apr 1767 in PA d. 30 Jul 1846 in Moniteau Co., MO, son of Daniel Yarnell, and Jane Duncan b. 1772; she had the following known siblings: Malinda Ann (her twin) who married Daniel Charles McLain; Isbella, Rachael, Frances, Minerva, Isaac, Martha, Henry John who married Ellen Murray, Rebecca who married John Tillery Jr., and Jane who married Alfred Standifer. Polly married on 3 Feb 1818 in Knox Co. TN, James David McClain (buried at this cem.).