He was born circa 1770. His father was Francisco Angel de la Garza, and his mother was Maria Cayetana Peña. His father owned Mier 14 grant.
He married Maria Ignacia Saenz, daughter of Gregorio Saenz and Maria Margarita Gonzalez in 1797. He was 27 years old, and the bride was 16 years old. Her father owned Mier 74 grant.
In 1782, he lived in San Andres del Arcabuz in household number 122. The church census recorded that he was a child, español, and 12 years old. His household included 10 people:
Francisco Angel de la Garza, married, español, age 46.
Maria Cayetana Peña, an unmarried girl, española, age 39.
Maria Juana de la Garza, an unmarried girl, española, age 20.
Jose Marcelino de la Garza, a youth, español, age 18.
Maria Balbina de la Garza, a child, española, age 14.
Pablo Jose de la Garza, a child, español, age 12.
Juan Jose de la Garza, a child, español, age 10.
Maria Salome de la Garza, a young child, española, age 7.
Carlos Valentin de la Garza, a young child, español, age 5.
Jose Rafael de la Garza, married, español, age 1.