sentences:  He married Nancy Coryell and they had three children, Elijah, Mary, and John.He studied medicine in Great Barrington, Massachusetts
  
  In 1812, Barstow moved to Tioga County, and there worked at his father's farm and taught school.Within a year he had become good friends with Judge Coryell (a powerful and influential figure in local politics) and by 1813 had married the Judges' daughter Nancy.