See The Smedley Family by Gilbert Cope for more on these Calverts. It is on microfilm at Family History Center #1036012. PP. 121 and 122 have a brief history of the Calvert family of Chester Co. P. 218 has the family of William and Jane Craig. William Calvert is the son of Thomas Calvert and Sarah Williamson. Siblings include Joshua, Rebecca, John, Daniel, Isaac (who is my interest), Thomas, and Deborah. Jim Ray