Kabilan Vairamuthu is the second son of authors Vairamuthu and Ponmani Vairamuthu. Vairamuthu is a lyricist and a seven-time National Award winner. Ponmani, a Tamil scholar, published poetry collections and a novel and worked as a lecturer in Meenakshi College for Women, Chennai for 22 years. Kabilan's elder brother Madhan Karky has a doctorate in sensor networks and is a lyricist. Kabilan's wife Dr.Ramya, is a gynecologist and laproscopic surgeon
