EricHays1 on Family Tree Circles

Hello- does anyone know the parents of John Hays born 1822 in Greenville TN? I have seen that John may be the son of Robert Hays (b. 1768) and Jane Montgomery, but I have not been able to ?prove? this possibility.
Provided is the link to the Greene County 1850 Census that lists John and his family (at the bottom)

http://www.census-online.com/transcript/tn/greene/232A.html

Any information would be greatly appreciated!

Thank you,
Eric Hays