The Espy-Espey book lists your James Espy born 2 Dec 1790, one of 10 children of Samuel and Martha Chambers Espy. They married 6/16 Nov 1778 in Philadelpha PA. It states that Captain James Espy married 1811 to Miss Swain, daughter of a Methodist minister. Children are 1-Samuel C Espy born 1812in Germantown (Philadelphia) PA, died 1891 in South Dakota, married to Jane Humphrey in 1832. 2-Margaret Espy who married Mr. Freas. Margaret lived and died in Philadelphia. Ancestry is 1-Josiah and Priscilla Mitchell Espy, 2-Josiah and Elizabeth Crain Espy, 3 Samuel and Martha Chambers Espy, 4 Captain James Espy married to Miss Swain.