I have not been able to find Thomas P. Cornett in the 1850 or 1860 censuses as a child, even though his marriage record (in Grayson Co. in 1862) says that he was born in Grayson Co., around 1841 or 1842 judging by his age. I should look at the Comer records; perhaps his mother had already remarried by 1850, or she might have died young and Thomas been raised by her parents or one of her brothers or sisters.

Rowan Co. marriage register A, p. 42, records the marriage on 11 Dec 1891 of T. P. Cornett and Rutha J. Springer.