James Willem Loudon (1904-1973) (1904–1973) Parents Anna Petronella Alida van Marken Hugo Loudon Children Lydia Frederika Loudon James Theodore Loudon Erik Hugo Loudon Eugenie Mary Loudon Ronald Henry Loudon Margaretha Eugénie Adrienne Loudon James Alexander Loudon Siblings John Hugo Loudon Jonkheer Hugo Alexander Loudon Partners Margarethe Katharine Osieck