He was born circa 1589. His father was Marcos Alonso de la Garza y Arcon, and his mother was Juana Treviño Quintanilla.
He married Maria Ines Rodriguez Martinez Guajardo, daughter of Juan Francisco Martinez Guajardo and Ursula Ines Catarina Navarro Rodriguez in 1610. He was 21 years old, and the bride was 25 years old.
Elena de la Garza Rodriguez. She married Juan Cavazos del Campo, son of Gabriel Cavazos and Simona del Campo.
Mariana de la Garza. She married Feliz de Mendoza, son of Juan de Mendoza.
Joseph de la Garza. He married Josepha Gonzalez de Leon, daughter of Alonzo de Leon and Josefa Gonzalez Hidalgo Leal. He married Maria de Solis.
Elena de la Garza. She married Sebastian Perez de Gumendio.
Pedro de la Garza Rodriguez, born 1613. He married Maria Lucia de la Rocha, daughter of Juan de la Rocha.
He died on 8 Feb 1639 in Salinas Victoria. He was 50 years old.