Son of William Knisely and Alice Cassandra Catherine (Duvall) (McCutcheon) McNurlin. His parents were not married. His birth is recorded as:

John G. Dewall entry, Greene County Births 1: 43: line 9, County Clerk's Office, Courthouse, Waynesburg, Pennsylvania.

Further confirmation of his parentage is found in his World War I military records, particularly in:

Pennsylvania Historical and Museum Commission (PHMC), "WWI Veterans Service and Compensation Files, 1917-1919, 1934-1948," digital images, Ancestry.com (http://search.ancestry.com/search/db.aspx?dbid=60884 : accessed 28 October 2017), Catherine A. Duvall (now McNurlin), mother of John Grimes Duvall - application no. 178355; citing World War I Veterans Service and Compensation File, 1934–1948 (RG 19, Series 19.91), PHMC, Harrisburg, Pennsylvania.

Son of William Knisely and Alice Cassandra Catherine (Duvall) (McCutcheon) McNurlin. His parents were not married. His birth is recorded as:

John G. Dewall entry, Greene County Births 1: 43: line 9, County Clerk's Office, Courthouse, Waynesburg, Pennsylvania.

Further confirmation of his parentage is found in his World War I military records, particularly in:

Pennsylvania Historical and Museum Commission (PHMC), "WWI Veterans Service and Compensation Files, 1917-1919, 1934-1948," digital images, Ancestry.com (http://search.ancestry.com/search/db.aspx?dbid=60884 : accessed 28 October 2017), Catherine A. Duvall (now McNurlin), mother of John Grimes Duvall - application no. 178355; citing World War I Veterans Service and Compensation File, 1934–1948 (RG 19, Series 19.91), PHMC, Harrisburg, Pennsylvania.