His beloved father late Regi Ranatunga, was one of the most colourful and outstanding political leaders ever produced by mother Lanka who served the country as a District Parliament Minister representing Gampaha district, a Deputy Cabinet Minister, a Cabinet Minister and a Governor. Nayana Nandani Ranatunga who was his mother was a great teacher loved by thousands of students all over the island. Ruwan Ranatunga has five elder brothers namely, Dammika Ranatunga, Arjuna Ranatunga, Nishantha Ranatunga, Prasanna Ranatunga and Sanjeewa Ranatunga.
Dammika Ranatunga was a former Sri Lankan Cricket player and currently, he is the Chairman of both Sri Lankan Port Authority and Ministry of Petroleum Development.
The well-known cricketer, Arjuna Ranatunga and 1996 Cricket World Cup winning captain is today the Minister of Ministry of Ports and Shipping and Ministry of Petroleum Resources Development.
Nishantha Ranatunga was the former Secretary of the Sri Lankan Cricket (SLC) who is a major contributor in creating the success story of Sri Lankan cricket history.
Parliamentarian Prasanna Ranatunga is one of Ruwan Ranatunga’s elder brothers who represented Gampaha district as the Chief Minister of Western Province for two consecutive times.
The next one of Ranatunga family is Sanjeewa Ranatunga who strives to influence the local community aiming for a better tomorrow through local media.