"William Calhoun, came from Ireland in boyhood with his father, James Calhoun. The latter was twice married, first to a Miss Templeton, and second to Sara Walker, William Calhoun married Miss Elizabeth Lytle.

Samuel Calhoun, son of William and Elizabeth Calhoun, became the owner of a farm in Armstrong township, this county."

Stewart's History of Indiana County, 1913.  Biography of William T. Calhoun. 
http://freepages.genealogy.rootsweb.ancestry.com/~treasures/pa/indiana/stewartshistory/williamtcalhoun.pdf.