He married Agustina Uribe de la Cadena Lobo, daughter of Antonio Uribe de la Cadena Vergara and Maria Isabel Lobo Guerrero de las Casas.
Luisa Fernandez de Castro. She requested a dispensation to marry Antonio Cavazos.
Pedro Macario Fernandez de Castro. He married Maria Cavazos, daughter of Antonio Cavazos de la Garza and Bernarda Rodriguez de Montemayor on 28 Sep 1712 in Monterrey.
Maria Jacinta Fernandez de Castro. She married Juan Cavazos, son of Antonio Cavazos de la Garza and Bernarda Rodriguez de Montemayor.
Josefa Fernandez Uribe. She married Miguel Cavazos, son of Antonio Cavazos de la Garza and Bernarda Rodriguez de Montemayor on 8 Feb 1717 in Monterrey.