Radikaa's grandmother act and Rs 50 crore-run: Thaai Kizhavi shakes Tamil box office  India Today Over 300% ROI in 12 days: How Sivakarthikeyan's Tamil rural film starring a 63-year-old actress became sur  The Economic Times 'Thaai Kizhavi' box office collections day 15: Radikaa Sarathkumar's film nears Rs 50 crores  The Times of India ‘For the first time…’ Radhika Sarathkumar praises Sivakarthikeyan for giving salary plus profit...  Moneycontrol.com A Rs 9 cr Tamil film made with no ‘big hero’ returns 6x its cost: Radhika Sarathkumar on Thaai Kizhavi’s true success without jacking up ticket prices  The Indian Express