I know the relationship. I have a copy of Manervia McKinley's last will. He is her son. She married John McKinley in Meigs Co. TnDec. 15, 1849. His first wife had died in 1845.John and Manervia had a daughter Mary Elizabeth McKinley born in 1851.Everything in her will goes to Mary E. except $5.00.She is living with Mary and James Tallent.