Jose Cosme de la Garza was born circa 1756, the son of Juan de la Garza and Maria Gertrudis Chapa.
He married Maria Josefa de la Peña on 16 Jul 1780 in Mier.
In 1782, he lived at La Bonita/ San Nicolas. The church census recorded that he was married, español, and 26 years old. His household included 3 people:
Jose Cosme de la Garza, español, married, age 26.
Maria Josefa Peña, española, married, age 20.
Maria Tomasa de la Garza, española, a young child, age 6.