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

Joseph was born on October 22nd, 1767.1   Joseph's father was Oliver Lyman and his mother was Eleanor Lyman.  His paternal grandparents were Gad Lyman and Thankful Pomeroy; his maternal grandparents were Joseph Lyman and Abigail Lewis. He had a brother and a sister, named Erastus and Mary.  He was the youngest of the three children.1 

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