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

Cyrenus was born on August 17th, 1768.1   Cyrenus' father was Caleb Gibbs and his mother was Marjorie Stuart.  His paternal grandparents were Benjamin Gibbs and Abigail Marshall. He had two brothers and five sisters, named Caleb, Aschsah, Candace, Statira, Sally, Peggy and Phoebe.  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