Hi, I have been searching for more information on this couple.I have been through many records for Warren and Clinton counties.There are listings for Banksons.I really believe that is the correct name for Mary Ann.Even though one marriage record has Joseph Stephenson md Mary Ann Benson 7 Jan 1819 in Warren Co. another entry lists Joseph Stevenson and Mary Ann Beinkson 5 Jan 1819 Warren Co.
While checking the marriage consents book for Warren Co., OH.I find an Edward Bankson and Margaret Turnpaugh 4 May 1829 by Mary Bankson for her son. If my theory is correct that Joseph Stephenson/Stevenson who married Mary Ann Benson/Bankson/Bankston are the parents of my William B. Stephenson b. 13 Aug. 1826 in Warren Co. then there must be some proof out there somewhere.Have you by any chance done any research on the Bankson line?What few entries I have located have not helped me so far other than to establish that there were Banksons in both Warren and Clinton counties.Have you searched in Butler Co. for death records for Joseph Stephenson?I can find no mention of his death in Clinton Co.It might be that he moved to Butler Co. with his daughter and her family.If only there were a death notice or obituary it might answer many of my questions.
I hope you have had more luck than I have in this search.