Moses Coates is listed as a brother in law in the 1775 Chester Co. PA will of Abraham Musgrove naming his sister, Hannah Coates, wife of Moses and his sister's children Elizabeth and Hannah Coates who were under age 18.
[S3115] McIntyre, Susan, Email dated 2003 (from sbmc2@chartermi.net in which she quotes a listing of various records published in books about Maryland and Virginia).