I have heard N Harish in two occassions , and he is really an impressive singer . His diction and style of singing reminds of his Guru N Vijay Siva . I do know his sister(Roopa Rajagopal???) plays violin too and in the concerts that I attended he was accompanied by his sister.
A review of his recent trichy concert http://www.thehindu.com/arts/music/article2834242.ece