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Male Nathaniel Barber Click to view Nathaniel Barber in the family tree

Nathaniel was born after 1740.1   Nathaniel's father was Nathaniel Barber and his mother was Hephzibah Loomis.  His paternal grandparents were Nathaniel Barber and Mary Filley; his maternal grandparents were Ichabod Loomis and Hephzibah Loomis. He had three brothers and five sisters, and also two siblings of unknown gender, named Elijah, Timothy, Eli, Hephzibah, Chloe, Lois, Susa, Jemima, Keziah and Ziba.  He was the second oldest of the eleven children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw