Jose Santiago Garza was born circa 1766, the son of Juan Tomas Garza and Maria Gertrudis Vela.
In 1782, he lived at Miguel Perez. The church census recorded that he was a youth, casta, and 16 years old. His household included 7 people:
Juan Tomas Garza, casta, married.
Maria Gertrudis Vela, casta, married.
Jose Antonio Garza, casta, single.
Jose Fabian Garza, casta, single.
Maria Antonia Garza, casta, an unmarried girl, age 20.
Jose Santiago Garza, casta, a youth, age 16.
Juana Maria Garza, casta, a young child, age 5.