my g-g-grandfather was Christmas Walter ROBERTSON (1820-1891).
I have him in 1853 marrying Sarah Cassandra BRADSHAW(1831-1920), daughter of Amzi BRADSHAW and Hannah BROWN, great-grand-daughter of James WATSON.
from here going back in time, its pure conjecture.
this is just my idea, but some facts fit.
in 1850 Nashville (there was a paper announcing CW's marriage saying he was from Nashville), there is a WC ROBERTSON living with an A(bner)B(aldwin) ROBERTSON and his family.
Abner's in laws were from Bedford Co. Tn, where Sarah's (BRADSHAW) family was living in the 1850 census.
It has been said that Abner had a brother that went to Texas (CW went to texas) and another brother went to something like Kansas.
My g-g-grandfather CW ROBERTSON followed the traditional naming pattern.
with that in mind, his father would have been William and his mother Elisabeth.
Abner's mother and father were William Nathaniel ROBERTSON and Elizabeth BALDWIN. William Nathaniel was from Orange Co. NC. I believe he had a brother William that married Aris NEVILLE, there was a Nathaniel acting as bondsman.
There father is believed to be Nathaniel ROBERTSON who married Elizabeth MARRIOTT. And he is believed to be the son of Athenatious ROBERTSON and Cordelia PHENIX.