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Male Henry Martyn Lyman Click to view Henry Martyn Lyman in the family tree

Henry Martyn was born on October 27th, 1821 in Vernon, NY.1   Henry Martyn's 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, Thomas, Edward, Cornelia, Mary Elizabeth and Eurotas.  He was the third 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