Mozart's youngest son, Franz Xaver Wolfgang Mozart (also known as Wolfgang, Jr.), was born on July 26, 1791 in Vienna, around five months before his father's death. Franz Xaver's never really getting to know his father seemed to have no impact on his veneration for him. His whole life, Franz Xaver had a great devotion to his father's music. He not only inherited Mozart's love for music; he became a fine composer/musician himself, studying under several teachers...most notably Antonio Salieri.
In this video, one can certainly hear whose son he is! This is Franz Xaver Mozart's Violin Sonata in B Flat Major, 3rd Movement, Presto.
Franz Xaver passed away on July 29, 1844 in Karlsbad. His veneration for his father was so great that his tombstone reads:
May the name of his father be his epitaph, as his veneration for him was the essence of his life.