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Female Mary Holcomb Click to view Mary Holcomb in the family tree

Mary was born after May 3rd, 1774.1   Mary's father was Hermes Holcomb and her mother was Lucy Alvord.  Her maternal grandparents were Joseph Alvord and Lucy Griswold. She had two brothers and a sister, and also a sibling of unknown gender, named Hermes, William, Selina and Almerin.  She was the third 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