Question: Which Indian television host and playback singer was once the other half of a popular singing duo with his older sister?
Sentence (from "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.
Relevant evidence: Yes