Brandon, You say Hannah may have been the first wife of Joshua. I'm sure you're aware of these pages below from Find-A-Grave listing the children. These seem to be more definitive but I'm not sure of the sources of the Find-A-Grave information. Just wondering your thoughts.
The Find-A Grave page for Joshua Pettit https://www.findagrave.com/memorial/9015886/joshua-pettit
states "Joshua Pettit was married twice, a old record found in the possession of his eldest son Henry partly obscure some parts readable list with his children with Hannah and with Rachel ...In Elizabethtown New Jersey he had a daughter, Hannah in 1758 and son Henry in 1763 before he removed to the Shenandoah Valley."
The Find-A Grave page for Rachel Monroe Pettit https://www.findagrave.com/memorial/9015908/rachel-pettit#
states "Joshua's children source Henry Pettit Sr. Family Bible & fathers Joshua Pettit's records
Joshua & Hannah Pettit children,
Hannah Pettit b. 1758 Joel Hembree
Henry Pettit b. 1763 Anna Pool
Joshua Pettit b. 1764 Judith Poole
Joshua & Rachel Pettit children
Mary Pettit May 20 1767-July 20 1769
Benjamin Pettit b. July 26 1769-Elizabeth Hindman
John Pettit Sept 2 1771
Nathan Pettit b. Sept 22, 1775 m Levina McCollum
Abraham Pettit b. Oct 29, 1776
Rachel Pettit b. April 9, 1779 m. Hugh Davis 2nd Johnston Hembree"
I just figured out my Pettit family connection and it seems to be correct.
Joshua Pettit ->Henry Pettit ->Elizabeth Pettit Mooney -> Joshua Mooney -> George Washington Mooney Sr. ->George Washington Mooney Jr. ->Ruby Jewell Mooney Clark ->Robert Clark ->Aaron Clark
Thanks,
Aaron Clark