Sarah is a daughter of James Edward South (1855-1904) and Mary Crumley (1867-1896). Her older sister may be Laura E. South (1881-????). Her younger brother is Kinney South (1887-1910). Her step-mother is Venie (Sarah Louvena Moore 1879-1964). Her half-brothers are Robert Edward South (1897-1986) and Hubert Lee South (1902-1981). Her half-sister is Ollie Mae South (1900-????).
I have no records for her sister Laura. Family info only, not sure about family source. The last record I have on Sarah is the 1900 census for Sullivan County, TN.