I hope you are still reading these pages -- I think I have a lead for you.I am researching Jane Swinney, daughter of Roseanna Swinney, who married William Mays in Amherst Co VA in March 1788.My husband is descended from this William's half-brother Pierce Wade Mays.I have found mention of a Joel Swinney in the Amherst co. marriage records -- Joel Swinney surety for the marriage of James Cash and Nancy Wright on 20 Oct 1792.
This is only guessing, but I think Roseanna Swinney was the daughter of Howard Cash.She would have had a brother Joel Cash, whose daughter Rhoda married Charles Mays.I think Joel Swinney was Roseanna's son.There is also a Joel Mays in the same time frame.Roseanna's husband was deceased at the time of her daughter's marriage. In June of 1788 she married Jonathan Eammes. I have not yet discovered her first husband's name.
Another clue is your Latham connection.A William Mays was married to Sarah Latham in Stafford Co in 1756.He and Sarah moved to Amherst around 1769 and lived for a while near the Cash and Swinney families, but moved to KY around 1789.