I show William Davis Siniard being the son of Jonathan Wilbourne Siniard (b. 7/23/1826 in Buncombe Co, NC and d. 12/19/1882 in DeKalb Co, AL.Jonathan married Malissa D. Owens Oct. 8, 1857 in DeKalb Co, AL.She was born March 20, 1834 in possibly Walker Co, GA and d. June 11, 1879 in DeKalb Co, AL.This William Davis may not be the one you're looking for since I show him b. Sept 2, 1858 d. July 11, 1925 in AL.No record here of them moving to TX.
Also, he married twice: 1) Princes "Etta" Kearley about 1880 (she was born 1857, d. 1887) and 2) Manada Eula Porter (May?) on June 26, 1888.She was born 1865 d. 1954.
He had 2 children by 1) and 8 by 2)Let me know if this is the one you're looking for--I have a big book with a lot of info.