Mercy Massie Bass has two sets of parents at the moment. Looks like she only needs John Crawford and Elizabeth Crawford (who may really need to be noted as Unknown wife of John Crawford according to DAR records). I cannot find anything in the SC Archives, but still searching Did find this in Sellers....
From W. W. Sellers "History of Marion County, SC" :
There was another family of Crawfords, descendants of old John, but in a different branch of the family-Hal Crawford and a brother, named John, and two sisters, the wife of Cross Roads Henry Berry, and Mercy Bass, wife of Joseph Bass (senior). Berry's wife was named Charity.