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

Thomas was born on March 19th, 1824 in Vernon, NY.1   Thomas' father was Orange Lyman and his mother was Maria Dewey.  His paternal grandparents were David Lyman and Mary Brown; his maternal grandfather was Stephen Dewey. He had three brothers and two sisters, and also a sibling of unknown gender, named Stephen Dewey, Henry Martyn, Edward, Cornelia, Mary Elizabeth and Eurotas.  He was the fourth oldest of the seven 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