You have it nearly correct the details are accurate but there is a gap. John Thornton and Mary Ann Redford (or Radford)has a daughter Margaret A. Thorton who maried Richard Chew. Richard and Margaret Chew had Minard Thomas Chew who married Nelly Gay Evans. Minard and Nelly had Richards grandfather and my grandfather (Minard Cliford Chew. Disclaimer (working on details to prove).