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Male Seth Lyman Click to view Seth Lyman in the family tree

Seth was born on September 8th, 1772 in Northfield, MA.1   Seth's father was Seth Lyman and his mother was Eunice Graves.  His paternal grandparents were Joshua Lyman and Sarah Harmon. He had four brothers named Tertius, Phineas, Samuel and Aaron Graves.  He was the third oldest of the five children.  He died at the age of 85 on February 24th, 1858.1 

1 phelps.FTW
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #2332, 2332.ftw, phelps.FTW @ Tree #1353, World Family Tree Vol. 1, Ed. 1 @ Tree #3310