Confused

Kelley4158

My grandmother Ruby Poston was enrolled in school by a Liddie Sullivan. Im trying to figure out where she got her indian ancestry from. Ruby was born may 12th 1916. Her school records show 1915. Im guessing her mother is not the one that enrolled her at the time. I see names of people I recognize but dont know how they are connected. Unfortunately my mother passed along with information that I should of got before hand. Im trying to figure out everything and am having severe difficulties. Rubys daughter listed was Dorothy Cook. My mother Loretta Cook i haven't found yet. Any help at all would be deeply appreciated