- Born October 1, 1924 in Manns Choice, Bedford County, Pennsylvania.
- Parents were NOAH JACOB DUNCAN and RACHEL MARGARET HITECHEW.
- Married BEVERLY ANN KAGAIRSE. She was born January 16, 1936 in Blair County, Pennsylvania; died December 19, 1979. Her parents were JOHN CALVIN KAGARISE and ARVILLA MAE MILLER.
- Died August 25, 1996 in Bedford County, Pennsylvania.
CHILDREN
- THOMAS CALVIN DUNCAN, born March 28, 1955 in Bedford County, Pennsylvania; died February 15, 2014 in Somerset County, Pennsylvania.
- JAMES ROBERT DUNCAN, born August 19, 1959 in Bedford County, Pennsylvania; died September 3, 2006 in Bedford County, Pennsylvania. Married LISA PERDEW.
- WILLIAM LEE DUNCAN, born October 14, 1960 in Bedford County, Pennsylvania; died February 28, 2016 in Beddford County, Pennsylvania.
- BRIAN JAY DUNCAN, born November 28, 1963 in Bedford County, Pennsylvania; died July 11, 2012 in Latrobe, Westmoreland County, Pennsylvania. Married CHRISTINE A. ZOLDOSH.