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Male Joab Griffin Click to view Joab Griffin in the family tree

Joab was born on February 4th, 1759.1   Joab's father was Benoni Griffin and his mother was Mary DeLacy.  His paternal grandparents were Thomas Griffin and Elizabeth Welton. He had six brothers and six sisters, named Benoni, Peter, Abner, Phineas, Abraham, Levi, Hannah, Mary, Elizabeth, Martha, Ninian and Matilda.  He was the seventh oldest of the thirteen children. He had a half-sister named Martha.1 

1 2655.ftw
Further source/citation:
World Family Tree Vol. 2, Ed. 1 @ Tree #2655