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

Jonathan was born in 1735.1   Jonathan's father was Benjamin Gilbert and his mother was Elizabeth Marshfield.  His paternal grandparents were Joseph Gilbert and Elizabeth Smith; his maternal grandparents were Josiah Marshfield and Rachel Gilbert. He had five brothers and four sisters, named Elnathan, Benjamin, John, Jabez, Jesse, Rachel, Elizabeth, Elizabeth and Mary.1 

Family Details of Jonathan's family with Lydia Olmstead

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw