Infanta Maria Antonia of Portugal Portuguese Royal (1903–1973) Parents Maria Theresa of Löwenstein-Wertheim-Rosenberg Miguel de Bragança Children Maria Mafalda Teresa Chanler Siblings Franz Joseph de Bragança Filipa de Bragança Maria Theresa of Portugal Miguel de Bragança Duarte Nuno, Duke of Braganza Infanta Maria Benedita of Portugal Mafalda de Bragança Maria Ana of Portugal Isabel Maria of Braganza Infanta Maria Adelaide of Portugal Partners Sidney Ashley Chanler