Coursey Family

In 1749/50 William Coursey sold John Dickerson 200 a in Louisa Co.In 1755 William and Ann Coursey sold 368 a. to John Dickerson in Louisa Co., VA.John Dickerson was married to a Mary.Was it Mary Coursey d/o William and Ann?Does anyone have any knowledge of William and Ann Coursey and their children who lived in Louisa Co., Virginia?Thanks.