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

Roswell was born on July 9th, 1755.1   Roswell's father was Daniel Lyman and his mother was Eleanor Fairchild Benedict.  His paternal grandparents were Benjamin Lyman and Thankful Pomeroy. He had two brothers and a sister, named Daniel, Elihu and Sarah.  He was the second oldest of the four 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