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?
Mozart family grand tour:  At the start of the tour the children were aged eleven and seven respectively. Mozart family grand tour:  Their extraordinary skills had been demonstrated during a visit to Vienna in 1762, when they had played before the Empress Maria Theresa at the Imperial Court.
i don't know