I don't know if this will help,but my last name is Melvin,and I used to live in Monticello. I'm not sure,but my great-great-grandfather is named Thomas Melvin,but I'm not sure of his middle initial. He lived around the timeframe of your Thomas though(: Great grandfather-Walter Melvin Grandfather-Douglas Grant Melvin(died 1967) Father-Thomas Walter Melvin(born 3/10/1968)
Hopefully this will help! Feel free to email me if you have any questions!