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

Jonathan was born on December 13th, 1747 in Westfield, MA.1   Jonathan's father was Jonathan Loomis and his mother was Hannah Seldon.  His paternal grandparents were William Loomis and Martha Morley; his maternal grandparents were Ebenezer Seldon and Elizabeth. He had seven brothers and three sisters, named Noadiah, Justus, Uriah, Pliny, Josiah, Clarke, Hezekiah, Hannah, Lucy and Charlotte.  He was the 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