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

Isaiah was born on September 8th, 1817 in ,Miami,OH.1   Isaiah's father was Isaac Duncan and his mother was Hannah Pemberton.  His paternal grandparents were Samuel Duncan and Mary Embree. He had a brother and a sister, named John and Rachel.  He was the oldest of the three children. He had seven half-brothers and three half-sisters, named Jesse, William, Samuel Hall, David, Amos Embree, Eli, Isaac, Polly, Abigail and Elizabeth.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