What is the full name of the eldest sibling who performed for the Empress Maria Theresa at the Imperial Court during a visit to Vienna in 1762?
Maria Anna Mozart Maria Anna Walburga Ignatia Mozart (30 July 1751 – 29 October 1829), called Marianne and nicknamed "Nannerl", was a musician, the older sister of Wolfgang Amadeus Mozart and daughter of Leopold and Anna Maria Mozart.
Archduke Ferdinand Karl Joseph of Austria-Este Archduke Ferdinand Karl Joseph of Austria-Este (25 April 1781 – 5 November 1850) was the third son of Archduke Ferdinand of Austria-Este and of his wife Princess Maria Beatrice Ricciarda d'Este, last member and heiress of the House of Este. For much of the Napoleonic Wars he was in command of the Austrian army.