The Martin Duncans in TN were not born in MO nor were they the rigth age to be son of John C, even if one was the son of John and Mary Duncan. I do not know who the parents of John S. Duncan born in KY 1815-20. My daughter search for his mariage Licenxe In the Court House in Lincoln Co., KY but to no avail. Thanks for trying to help. Bill Mills milsgene@iocc.com