Image # 175 and 176 on the familysearch site: Mentions wife Nancy, and widow's surety posted by James Alexander, which is indicative that Mary Payne was Reuben's daughter. Also marriage bond for Mary at http://www.kykinfolk.com/mason/bk1bride.html
Marriage Abstract 1, 1789-1805, Mason County, Kentucky: 29 Dec 1800 This is to testify that I am willing for James Alexander to marry my daughter Mary [signed] Ruebin Payne.
[Witness] Daniel O'Banian and Daniel Payne