Source:Curfman, Robert Joseph. Petty-Pettis Genealogy, shows a Sarah Petty, b. Freetown Sep 1699, d/o James Petty and Mary Lawton. She would be an obvious candidate for Joshua's wife. No details are given beyond her birth, however. Note that said Sarah had a brother Ebenezer who m. Patience Chase, and his daughter Mary married Zenas Cowing, the son of Joshua and Sarah.