Nathan Smith appears to have been raised by his grandparents John Smith and Mary Magdalena Simmons. His father was either Jacob, Henry or Daniel Smith sons of John & Mary Simmons Smith while his mother appears to have been a daughter of Michael Harold & Catherine Varner.
Mahulda Simmons was the daughter of Joseph Bodkin and Sarah Simmons who never married. Sarah 'Sally' Simmons was the daughter of Leonard Simmons and Catherine Smith. This Sarah died August 20, 1894 and her death was reported by her son-in-law, Nathan Smith as listed in the Pendleton County Grave Register II on page 76 item 22.
I find it interesting that Nathan & Mahulda, both born out of wedlock, were married for 61 years raised 11 children of their own while never leaving the Ruddle, WV area for long.
I descend from their oldest daughter Christina Smith who married William Perry Hedrick. Christina's younger sister Lucy married William's younger brother James Hedrick.
Nathan Smith, his oldest son George Washington Smith, William Perry Hedrick and his younger brother James Hedrick all fought for their home State of Virginia during the Civil War.
As for Joseph Bodkin, I believe he was a brother to Mahulda but he was referred to as Josiah Bodkin in the 1870, 1900 and 1910 census and I believe he was born Josiah Simmons. Only the 1880 census records him as Joseph Bodkin.