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

Peter was born on November 13th, 1750.1   Peter'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, Joab, Abner, Phineas, Abraham, Levi, Hannah, Mary, Elizabeth, Martha, Ninian and Matilda.  He was the third 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