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Male Seth Williston Alvord Click to view Seth Williston Alvord in the family tree

Seth Williston was born on July 31st, 1819 in Onondaga, NY.1   Seth Williston'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, Nelson Clark, Juliette and Lucy Emeline.  He was the second youngest 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