 In 1920 Joaquín Bau married Pilar Elisa Carpi Esteller.The couple had 5 children; the oldest son Joaquín as a 16-year-old volunteered to the Carlist requeté unit, survived the Civil War and later became an engineer; José Luis served in the army as a lieutenant colonel and military judge, while Fernando practiced as a lawyer and a conservative politician.Between 1967 and 1977 he served in the Francoist Cortes; in 1991 he published "Crònica de veinte años.