 He also briefly lived in Paraguay.The marriage of his sister, Mirta Díaz-Balart, to former Cuban leader Fidel Castro as Castro's first wife made Waldo Díaz-Balart Castro's brother-in-law.His nephews include U.S. congressman Mario Díaz-Balart, former congressman Lincoln Díaz-Balart, and "NBC Nightly News" Saturday news anchor José Díaz-Balart.