What ethnicity are both S. Aishwarya and Radha Viswanathan?
S. Aishwarya S.Aishwarya born on 27 October in Chennai, Tamil Nadu) is an Indian singer of traditional Carnatic music. She is the great-granddaughter of M.S. Subbulakshmi. and the grand daughter of Radha Viswanathan
Balasubramanian Viswanathan B.Viswanthan was born in a small village located at the South of India called Kuthanoor in Tanjore district in Tamil Nadu State, India. He received Bachelor's and master's degrees in chemistry from St. Joseph's College, Tiruchirappalli India (1958–1964).He earned his PhD degree at IIT Madras, India in 1969. He is married to Late Vijayalakshmi Viswanathan and has a son who is a faculty member in the department of mechanical engineering at Carnegie Mellon University, United States.