 Romero Barceló married Kate Donnelly on January 2, 1966.His daughter, Melinda Romero Donnelly, was an NPP member of the House of Representatives of Puerto Rico for 8 years, later becoming state senator when she won a special election in 2009 for the vacant seat of former Senator Jorge De Castro Font.Romero Barceló is a boxing fan, and advocated for holding world championship bouts in San Juan during his terms in office.