Please note the Mary HAMPTON who m. Joshua COBURN in 1836 Trumbull County, OH, was NOT Mary HAMPTON (1799 PA), daughter of Moses and Hannah (Van Atta) HAMPTON.
Mary HAMPTON (1822 OH) m. Joshua COBURN. She was the daughter of Thomas HAMPTON, son of Moses and Hannah, and niece of Mary HAMPTON (1799).
Mary (1799) m. John McMAHAN.
I hope this helps clear up confusion about the two Mary HAMPTONs.