It is of great interest to me that your great grandfather is John Stone (?) Dwyer in middle Tennessee in the early 1800's to 1874.
My grandmother is Mattie DeWire. Mattie's Father is Patrick DeWire born in Ireland about 1830. I have recently learned he may have changed the spelling of his surname from Dwyer to DeWire. I am at brick wall on trying to find information on Patrick. I do not know where he came from in Ireland or when and where he entered the US. I also do not know the name of his parents. The first record I have of him is in Hickman County Tennessee on their 1860 census with his wife Ruth. His name was misspelled as Dorya. Since they did not have any children at this time, I believe they were probably married in 1859 or early 1860. Our early marriage records were destroyed in a fire during the civil war, so I do not have a record of the actual date of their marriage. Do you think your John Stone (?) Dwyer in middle Tennessee could be related to my Patrick DeWire/Dwyer?