Cant find ancestor to my late great grandmother lula williams born 1891 in bennettsville south carolina?

she married John williams born 1890 and had 3 kids but who is her parents and his parents, there no maiden name for her in the 1930 census please help me they lived in Marlboro County, Bennettsville South Carolina She had a daugther named Lula Southerland Who had 2 son and I cant find nothing on them. but my main goal is to find who Lula Williams 1891 parents are and john williams 1890 I heard my grand mother was a cherokee indian so if you can help with my family tree god knows ill thank you and thank generation after me thank you. wanda