May 17, 1780, Philadelphia, PA, Mary married Owen Jones who was born March 15, 1744/45, in Philadelphia. He was the son of Owen and Susannah Evans Jones. Owen's will was proved May 14, 1825. I have almost nothing on this Jones family and I am unclear if they were active in early Pennsylvania history. Owen's sister Lowry Jones married Daniel Wister May 05, 1760. I show Owen also marrying a Hannah Foulke but I am unsure whether she was his first or second wife.
In any case, Mary and Owen had a son:
Thomas Wharton Jones who was buried in Friends ground January 22, 1784. If there are any descendants of this line I have been unable to find them.