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

Erastus was born on February 9th, 1761.1   Erastus' 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 Joseph and Mary.  He was the oldest of the three children.1 

Family Details of Erastus' family with Abigail Bracket

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