Mary Samuels was born circa 1712 in Ireland and died before 1772, probably in Cumberland County, PA. She was the daughter of John Samuels Sr and Isabella Davies (Davis). She married Alexander McKinstry, Sr about 1730 and arrived with him in Bucks County circa 1732 with her first male child, Alexander Jr. Alexander Jr married Sarah (probably Ross) about 1764 in East Pennsboro, Coumberland County.