Which Indian television host and playback singer was once the other half of a popular singing duo with his older sister?
Sagarika:  Before going solo, she was half of a popular Indian duo with her younger brother Shaan with whom she released albums such as "Q-Funk", "Roop Inka Mastana" and "Naujawan". Shaan (singer): Shantanu Mukherjee (born 30 September 1972), known as Shaan, is an Indian playback singer active in Hindi, Bengali, Marathi, Urdu, Telugu and Kannada films and a television host.
Shaan