Biographical Sketch (1997):1753 "His first wife was Mary (d. 1763), daughter of Johannes Schleifer, immigrant of 1739 and descendant of an ancient Anabaptist family, whose ancestors Hans Schleifer was martyred in the sixteenth century. Johannes was baptized by Elder Peter Becker into the Great Swamp Brethren Congregation. His son, John Schleifer, was the first resident minister at Broad Run, Middletown Valley, Frederick County, Maryland. Johannes was a brother of Mary Steele."

1763 Death:1753 Emmert F. Bittinger, in an article in Mennonite Family History, gives Mary Shlieffer Steel's death year as 1763.

Death Prior to 1767:1895 Mary Shleiffer was deceased at the time her father Johannes made his will on 5 May 1767.