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

Jonathan was born on December 16th, 1753.1   Jonathan's father was Nathaniel Loomis and his mother was Sarah Ryley.  His paternal grandparents were James Loomis and Mindwell Drake. He had three brothers and three sisters, named Jabez, Nathaniel, Eleazer, Sarah, Eunice and Abigail.  He was the second youngest of the seven children.1 

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