The Wm
Coates that I have was born in Apr 1864,
Greene Co IL, to Alfred
Coates and Mary Alma
Monk Coates (Alfred's 2nd wife, who was also the sister-in-law of his first wive). Alfred was born abt 1829 in
Tennessee. About 1850 Alfred married #1 wife, Eliza Jane
Finley (the older sister of my GG Grandmother, Frances
Finley Monk) in
Arkansas. Mary's parents were
Shadrack Monk (b 20 Dec 1802 in
Russell Co VA) and Margaret (last name unknown) (b abt 1798 in NC). I've never heard about Indians in either of these lines, but, clearly, I don't know a lot.
HTH