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

Seth was born on May 6th, 1743 in Guilford, CT.1   Seth's father was Seth Alvord and his mother was Elizabeth Spencer.  His paternal grandparents were Thomas Alvord and Mary Strong; his maternal grandparents were Tomothy Spencer and Abigail Spencer. He had five brothers and four sisters, named Orren, Ruel, Seth, Huet, John, Damaris, Damaris, Anna and Elizabeth.  He was the second oldest of the ten children.1 

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