Donna, I found the following today. Seems to imply that a Reuben Hammond was an adult living in the Madison Co. OH area in 1818. Is it possible that our Reuben (I am descended from Lambert Hammond) has a father named Reuben??
From the history of Union County, Ohio - http://www.heritagepursuit.com/Untp2.htmhttp://www.heritagepursuit.com/Untp2.htm: Christian Church, Union Township. -It is believed this church was organized in the spring of 1818 with the following constituent members. viz.: Nicholas Hathaway, Elisha Reynolds, Anson Howard, Joseph Johnson, Jacob Burnham, Benjamin Harrington, Darius Burnham, Reuben Hammond, Alexandre McWilliams, Sophia Reynolds, Olive Howard, Lydia Johnson, Betsey Harrington, Lydia Sibley, Lucretia Burnham, Betsey Burnham, Betsey Hammond and Rosetta Smith. (Union County is just north of Madison County where a Reuben Hammond married Jane)