The grave marker shows his date of death as 12 Feb 18?0. It looks like a 6, but he shows up in the 1860 census. The generally accepted year of death is 1870. His Baptismal Certificate indicates that he was born 13 Nov 1826. So inscription doesn't match what the grave marker indicates. So far, no solid evidence has been found to support anything.
His biological mother was Veronica (Nachin) Beigh. Frances was his step mother.