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Male Jonathan Hayes Click to view Jonathan Hayes in the family tree

Jonathan was born after 1743.1   Jonathan's father was Jonathan Hayes and his mother was Mary Loomis.  His paternal grandfather was George Hayes; his maternal grandparents were Philip Loomis and Hannah. He had two brothers and a sister, named Philip, Moses and Mary.  He was the oldest of the four children.1 

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