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Male Elmer Duncan Click to view Elmer Duncan in the family tree

Elmer was born in 1861 in Union Twp.,Miami,OH.1   Elmer's father was William Duncan and his mother was Martha Langston.  His paternal grandparents were Isaac Duncan and Elizabeth Dickson. He had four brothers and three sisters, named Leonard, Ira L., Charles, William A., Sarah, Emma and Lucy.  He was the fourth oldest of the eight children.1 

1 1356.ftw
Further sources/citations:
World Family Tree Vol. 2, Ed. 1 @ Tree #1356, 1356.ftw, World Family Tree Vol. 2, Ed. 1 @ Tree #1356