His father was Tomas Garcia de Quintanilla, and his mother was Maria de la Garza Falcon Montemayor.
He married Ana Garcia de Sepulveda, daughter of Jacinto de Sepulveda and Juana de Arredondo.
Josefa Garcia. She married Jose Bernardo Irineo Guerra Cañamar, son of Andres Guerra and Maria Flores de Abrego.
Juana Micaela Garcia. In 1747, she requested a dispensation to marry Santiago de la Garza.
Maria Candida Garcia. In 1734, she requested a dispensation to marry Francisco de la Garza Guerra.