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

Jonathan was born on August 13th, 1722.1   Jonathan's father was John Loomis and his mother was Martha Osborn.  His paternal grandparents were Thomas Loomis and Sarah White; his maternal grandparents were John Osborn and Abigail Eggleston. He had three brothers and a sister, named John, Israel, Timothy and Martha.  He was the youngest of the five children. He had two half-sisters named Sarah and Ann.1 

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