Janie, I may be family!!!Richard McCoy and Maria Sifford are in Cass Co by 1850 (census); they had a large family (13 children).Could he be Nathan's brother? How many McCoys could there be in rural MI at that time and one of yours married a Sifford too!!!!
Their children were Charles, George, Emily, Herman, Isabel, John, Malinda, Marie, Moses, Samuel, Sarah, Susan, and Richard F. (b. 1849, Mi; d. 1908); he married Mary Ann (Molly) Stretch (1854-1931) and had five children, including Evah McCoy, who was my gt-grandmother.She married Frederick George Jones.Let me know if you want to know more!!