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

Caleb was born on March 11th, 1758.1   Caleb's 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 Cyrenus, Aschsah, Candace, Statira, Sally, Peggy and Phoebe.  He was the oldest of the eight children.1 

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