Ruth, St. Louis, 1850

Seek connection between Ruth Harness of 1850 St. Louis, MO, census (born ca1796, VA) and my gg grmother Ruth (Parks) Poston (1851-1932), who was then living in that household. Was Ruth H. grandmother or aunt of Ruth P.? (Parents/siblings of Ruth Parks died of contagion, 1854, St. Louis.)Thanks, MP.