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

Justus was born on June 19th, 1752 in Westfield, MA.1   Justus' father was Joshua Loomis and his mother was Abigail Langdon.  His paternal grandparents were William Loomis and Martha Morley; his maternal grandparents were John Langdon and Abigail Phelps. He had five brothers and five sisters, named Seth, John, Joshua, Enoch, Justus, Abigail, Lois, Abigail, Ann and Martha.2 

1 phelps.FTW @ Tree #0105
2 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw, World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw