I just ran across this marriage record for Samuel Ervin and a Mrs. Obedience Thomas in Salem, Meigs, Ohio on 13 July 1833. I think this must be Samuel Ervin Sr., as Samuel Ervin Jr had just married Nancy Pewthers on 27 June 1833 in Athens county and is still married to her in the 1850 census. The Samuel Irwin that lived in Scipio, Meigs, Ohio was married to Ruth Douglas on 16 Apr 1829 and is still married to her in the 1850 census. Is it possible that Mrs. Obedience Thomas was the "Jane" we see living with Samuel Sr. in the 1850 census? If so, she would not be Owen's mother.