One tree to consider is the Lacey Oak if the area is well drained.
Another might be a large type crape myrtle such as Natchez, trained to a single trunk. The following web site has info on the proper way to plant a tree:
I also suggest you contact your local Texas Cooperative Extension Office to speak with the Horticulturist about what trees they recommend for your area. Their contact info is:
306 N Loop 288, Suite 222
Denton, TX 76209-4887
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