He was born circa 1765. His father was Juan de la Garza, and his mother was Maria Gertrudis Chapa. His father owned Mier 23 grant.
In 1782, he lived in San Nicolas/ Santa Rosalia de la Bonita in household number 139. The church census recorded that he was a youth, español, and 17 years old. His household included 8 people:
Don Juan de la Garza, married, español, age 59.
Maria Gertrudis Chapa, married, española, age 51.
Juana Maria de la Garza, an unmarried girl, española, age 21.
Maria Guadalupe de la Garza, an unmarried girl, española, age 20.
Juan Jose de la Garza, a youth, español, age 17.
Maria Gertrudis de la Garza, an unmarried girl, española, age 13.
Jose de Jesus de la Garza, a child, español, age 11.
Maria Juliana de la Garza, a child, española, age 9.