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

Jacob was born on November 26th, 1720 in Simsbury, CT.1   Jacob's father was Josiah Loomis and his mother was Elizabeth Kelsey.  His paternal grandparents were Daniel Loomis and Mary Ellsworth; his maternal grandparents were Thomas Kelsey and Elizabeth. He had five brothers named Ebenezer, Thomas, Francis, Josiah and Benajah.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 2, Ed. 1 @ Tree #3466, 3466.ftw, World Family Tree Vol. 2, Ed. 1 @ Tree #3466, 3466.ftw, World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw