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.
Princess Theresa of Bavaria (b. 1931) Archduchess Theresa of Austria, German: "Theresa Monika Valerie Elisabeth Ludovika Walburga Anna, Erzherzogin von Österreich" (born 9 January 1931 at Schloss Wallsee in Amstetten, Lower Austria, Federal State of Austria) is a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth. Through her marriage to Prince Rasso of Bavaria, Theresa is also a member of the House of Wittelsbach and a Princess of Bavaria.