I did a little checking into your family, but did not have too much luck. I might help a little with Henry Clay Miller.
On the 1900 Knox Co KY. census Henry Miller b Mar 1860age 40 marr#2 2yrs, b Ky as did parents EmmalineDec 1870 age 29 marr#12yrs,1 child b, 1 Live WillardFeb 188416 b KY BoydFeb 186614" IsaacNov 18981
1910 KY Knox Co. West Flat Lick Henry C Miller51widower b KY Ky VA Isaac11KY Minnie9 Robert7 Ethel6 John H.4
on the 1880 census for Grayson County KY at Big Clifty Clay MillerFather21Farmer KY KY Ky Marthasister15keeping house all KY
( This might be the right fellow , but not proven as yet.)
The only Minnie I could come up with b in Ark that might fitwas a daughter of Aaron Burlison and wife Paralee 1900 Aaron age 35Paralee 36 a son unreadable b 1896 and Minnie b 1898Sorry I could not find something more helpful.Howard Boswell