Joseph W Gilleland and Sally Stevenson were granted a marriage license on December 2, 1841 in Hendricks County, Indiana. They were married the following day by John Jones, Minister of the Gospel. Her last name is spelled as "Stevenson" and "Stephenson" on the marriage license/registration as well as on the deathe certificates of some of their children. They both died in Missouri after 1800; exactly when I have not discovered.
Joseph W. and Joseph C. are positively related; I believe as nephew and uncle, respectively. You can contact me direct and I'll send you what ever I have.