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

Simeon was born about 1756.1   Simeon'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, Reuben, Sarah, Abigail, Anna and Hannah.  He was the fourth 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