> There seems to have been a lot of Abernathys in Giles Co. Tenn.
Oh, gosh yes. Lots! And quite a few in the counties just south of the Alabama line as well.
> Maybe someone has these names in their genealogy.
Well, I think I may have found your Willie, but no sign yet of Rachel Keel.
The 1880 Giles County Census has the following: District 6, p. 106, household #217-229, William R. Hood, 25, Farmer, b. TN-TN-TN; wife Louisa J. 29, b. TN-TN-TN; stepson Willie J. Abernathy 13, laborer, b. TN-TN-TN; stepdaughter Louisa I. Abernathy 12, b. TN-TN-TN, at home.
I was unable to locate any Abernathy family in my database or from a quick search on the internet that had those two children as of the 1870 census. Nevertheless, it looks to me like you may need to do some searches in Giles and/or surrounding counties for marriage records on Lousia.
And maybe someone will come forth any day now who knows all about them.