He was born circa 1600. His father was Juan Fernandez de Castro, and his mother was Mayor de Renteria.
He married Maria Rodriguez, daughter of Capt. Diego Rodriguez and Sebastiana de Treviño.
Diego Fernandez de Castro. He married Maria de la Cerda, daughter of Bernardo de los Santos Coy and Maria Ines de la Cerda. He married Ana Maria de los Santos Coy, daughter of Bernardo de los Santos Coy and Maria Ines de la Cerda.
Clara de Renteria. She married Sgt. Mag. Jacinto Garcia de Sepulveda, son of Anton Garcia and Ana de Sepulveda.
Maria Mayor Fernandez de Renteria, born 1621. She married Alonso de Treviño, son of Marcos Alonso de la Garza y Arcon and Juana Treviño Quintanilla.