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Male Nelson Clark Alvord Click to view Nelson Clark Alvord in the family tree

Nelson Clark was born on January 16th, 1815 in Burlington, NY.1   Nelson Clark's father was Seth Alvord and his mother was Lucy Bassett.  His paternal grandparents were Seth Alvord and Ruth Norcott; his maternal grandparents were Jonathan Bassett and Lucy Spafard. He had two brothers and two sisters, named Philo Gates, Seth Williston, Juliette and Lucy Emeline.  He was the second oldest of the five children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #0105, 0105.ftw @ Tree #0105