I believe the Jahue Martin listed in the census record to which you refer is AKA JF Martin. He was born in 1874, married Lily Cox in 1904 and died 10/5/1943. A copy of his death certificate can be found at http://www.wvculture.org/vrr/va_view.aspx?Id=405974&Type...
Martha was Jahue's mother and possibly unmarried when she gave birth to him. She later married a Peter Shaver.