Thanks to the wonderful folks at the Texarkana Genealogy Society on Rootsweb, I found 3 SON ancestors buried in the Gravel Hill Baptist Church Cemetery in Bowie, TX:
Son, George Washington 7/4/1869 10/25/1952
Son, James H. 5/10/1837 5/12/1903 Mil
Son, Lillie Frances 1/12/1881 2/17/1933
I think I am getting closer to finding the elusive Garrett SON. Keep your fingers crossed! :)