Valentin de la Garza was baptized on 10 Mar 1771, the son of Francisco de la Garza Ballesteros and Juana Reyna.
He married Juana Chapa on 10 Feb 1795 in Mier.
In 1782, he lived at Junta de los Rios. The church census recorded that he was a child, español, and 9 years old. His household included 11 people:
Francisco de la Garza Ballesteros, español, married, age 48.
Juana Reyna, española, married, age 41.
Juan Jose de la Garza, español, single, age 21.
Francisco Antonio de la Garza, español, a youth, age 18.
Cirilo de la Garza, español, a youth, age 17.
Dionicio de la Garza, español, a youth, age 15.
Juana Maria de la Garza, española, an unmarried girl, age 14.
Jose Celedonio de la Garza, español, a child, age 11.
Valentin de la Garza, español, a child, age 9.
Jose de los Santos de la Garza, español, a young child, age 6.
Maria Josefa de la Garza, española, a young child, age 3.