He was born circa 1672. His father was Pedro de la Garza de la Rocha, and his mother was Ana Diaz Botello.
He married Juana Flores de Valdez, daughter of Rodrigo Flores de Valdez and Josefa de la Fuente on 24 Jun 1692 in Monclova. He was 20 years old, and the bride was 18 years old.