Any help would be very much appreciated!

I am looking for my great great grandfather, Robert Lafayette Ferguson who was born November 30, 1819 in Tennessee.

One of his children was my great grandmother, Samantha Melvinie Ferguson who was born November 20, 1969 and died July 16, 1956.

Samantha married my great grandfather, Jeremiah (Jerry) Monroe Sparkman who was born October 10, 1859 and died January 18, 1928, but I don't know when or where they were married. Starting in the 1890's they were living in Corsicana, Texas and began a family there. Both passed away there and are buried there. Sparkman cousins abound throughout the South, but I can't seem to find the Fergusons.

Thank you for any help you can give me.