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 Louise of Belgium Princess Louise of Belgium (18 February 1858 in Brussels – 1 March 1924 in Wiesbaden) was the eldest daughter of Leopold II and his wife, Marie Henriette of Austria. Louise was named after her paternal grandmother, the Belgian queen Louise of Orleans, and her mother.