He was born circa 1715. His father was Juan Jose Baez de Benavides Vela, and his mother was Clara Maria Gutierrez de Lara Renteria.
He married Maria Margarita de Ochoa on 12 Feb 1735 in Cadereyta. He was 20 years old.
He married Maria Rita de Cuellar, daughter of Bartolome de Cuellar and Gregoria Martinez on 22 Oct 1753 in Mier. He was 38 years old, and the bride was 14 years old. It was his second marriage.
Maria Magdalena Baez de Benavides. She married Blas Maria Gutierrez de Lara, son of Bernabe Gutierrez de Lara and Antonia de la Garza Falcon.
Maria Tomasa Baez de Benavides, born 1763. She married Jose Joaquin Chapa, son of Jose Florencio Chapa and Margarita de la Peña on 13 Feb 1776 in Revilla. Her husband died on 21 Sep 1802. He was 48 years old.