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

Reuben was born about 1757.1   Reuben's father was Henry Gibbs and his mother was Abigail Martin.  His paternal grandparents were Benjamin Gibbs and Abigail Marshall. He had three brothers and four sisters, named David, Henry, Simeon, Sarah, Abigail, Anna and Hannah.  He was the third youngest of the eight children.1 

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