TC BAKER of Springfield, late 1800's
Between the years 1870 and 1875 (when their mother, Mary M Allen of MS, died) Donna Allen Baker (my grandmother) and Thurman Curtis Baker Jr (her brother) were born in or near Springfield, Sangamon Co, IL. Their father was Thurman Curtis Baker Sr. who was a prosperous businessman in Springfield in the late 1800's. Was still living in 1909. He has left no traces that I can find. Several family photos were taken in Cass Co but everyone says my grandmother was born and raised in Springfield. Wondering where to look for clues.
Any help on identifying parents or siblings of TC Baker Sr (ca.1840-after 1909) much appreciated.