I did find a little bit more during my lunch break.I've got you back another generation on your Alexander line.
Your Fellie Alexander is listed on the 1900 Census of Logan Co. KY in the household of his grandparents as follows:
Ike Alexandra Feb 1830 70 TN NC NC Susan Alexandra Nov 1837 62 wife TN TN TN Thomas Alexandra May 1874 26 son TN James Alexandra Jul 1863 36 son TN Stella Alexandra Jan 1878 22 daug-in-law TN Fellis Alexandra Jan 1898 2 grandson TN Thomas Alexandra Aug 1899 9/12 grandson TN
Note that all these individuals are listed as having been born in Tennessee.
This record indicates that Susan was the mother of 2 children, 2 of which were living.Likewise, Stella was then the mother of 2 children, 2 of which were living.
It also states that Ike and Susan had been married for 38 years = 1862.And, that James and Stella had been married for 3 years = about 1897.
However, I have not been able to find this family in Tennessee (or anywhere) on either the 1880 or 1870 censuses.