Dear Ms. Sletten,
Thank you for your question to History Hub.
For information about pensions your ancestor received due to his service during the Mexican War, please contact the Texas State Historical Association at https://www.tshaonline.org/. And during the Civil War, please contact the Texas State Library and Archives Commission at www.tsl.texas.gov/index.html.
Additional information may be found on NARA’s web pages concerning the Mexican War at https://www.archives.gov/research/alic/reference/military/mexican-war.html and concerning the Civil War at https://www.archives.gov/research/military/civil-war.
Thanks again for inquiring with History Hub and best of luck on your search!