Gottfried, the oldest brother, had been to Copenhagen from India with his son (Georg Friedlich) during Kuhlau was in his overseas travel(1821.3-1822.1.7). He had supported himself by music in Calcutta. Kuhlau told about him that he was a curious man. As he didn't know about the details of Indian music, it is estimated that his work was related to the European music. He had born his position as a musical director. It isn't recognized about the time when he left Germany to India, the year of his death or his works at all. He had left his son behind in Denmark. Kuhlau had brought up him and later he had debuted as a pianist in Denmark. This question is easy, isn't it?