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

Simeon was born on September 3rd, 1759.1   Simeon's father was Justus Gibbs and his mother was Hannah Lindsey.  His paternal grandparents were Benjamin Gibbs and Abigail Marshall. He had six brothers and five sisters, named Timothy, Levi, Justus, Daniel, Jerusha, Isaac, Loraine, Hannah, Irene, Preserve and Osias.  He was the oldest of the twelve children.1 

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