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Male William Holcomb Click to view William Holcomb in the family tree

William was born after May 3rd, 1774.1   William's father was Hermes Holcomb and his mother was Lucy Alvord.  His maternal grandparents were Joseph Alvord and Lucy Griswold. He had a brother and two sisters, and also a sibling of unknown gender, named Hermes, Mary, Selina and Almerin.  He was the 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