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

John was born on October 11th, 1821 in ,Miami,OH.1   John'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 Isaiah and Rachel.  He was the youngest 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