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Male Truman Gibbs Click to view Truman Gibbs in the family tree

Truman was born about 1757.1   Truman's father was Benjamin Gibbs and his mother was Dinah Woodruff.  His paternal grandparents were Benjamin Gibbs and Abigail Marshall; his maternal grandparents were Nathaniel Woodruff and Thankful Wright. He had three brothers and three sisters, named Benjamin, Ithmar, Lemuel, Azubah, Rhoda and Dinah Woodruff.1 

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 2, Ed. 1 @ Tree #1356, 1356.ftw, World Family Tree Vol. 2, Ed. 1 @ Tree #1356, 1356.ftw, World Family Tree Vol. 4, Ed. 1 @ Tree #1353, 1353.ftw