Mary Jefferis

Mary is the daughter of a different set of parent, albeit the father's name is James Bennett while the mother is Hannah Gilpin (not Hannah Hoopes). Hence her birth date precedes her mother's birth date.

Excerpt from the Smart Search panel for the daughter Mary:
Birth: Nov 29 1762 - Pennsbury Township, Chester County, PA
Death: Sep 2 1807 - East Bradford, Chester County, PA
Parents: James Bennett, Hannah Pierce (born Gilpin)
Siblings: Isaac Bennett, Sarah Pennock (born Bennett), Susannah B Pierce (born Bennett), Joseph Bennett, Jacob Bennett, Hannah Bennett, Joseph Bennett
Husband: Cheney Jefferis
Children: James Jefferis, Joshua Jefferis, Titus Jefferis, Cheyney Jefferis, Edith Jefferis, Mary Bennett (born Jefferis), Ann Jefferis, Lydia Jefferis, Martha Jefferis