Wolfgang and Constanze Mozart had six children, but only two lived beyond infancy. Though only five months old when his father died, the younger son, Franz Xaver Wolfgang Mozart, followed in Mozartâs footsteps to become a professional musician. One of his teachers, Antonio Salieri, said he had a rare talent for music and predicted that his career would be no less auspicious than his fatherâs had been.  Franz Xaver worked as a music teacher and toured Europe as a professional pianist, eventually settling in Vienna in 1838, six years before his death. He composed many works, including a festival chorus for the unveiling of the Mozart memorial in Salzburg. . And interestingly, Franz Xaver may have resembled his father in another way, as well. Both father and son allegedly had deformities of the left outer ear.  CITE SOURCE