Arulnithi and Mamta Mohandas are coming together for the first time in a film titled My Dear Sister. The makers unveiled the title through a short announcement video on Tuesday, introducing audiences to the world of Pachai Krishnan and Nirmala Devi, a brother and sister whose bond forms the heart of the story.The film is directed by Prabhu Jeyaram, known for Yennanga Sir Unga Sattam. It is being produced by Sudhan Sundaram of Passion Studios in collaboration with Manish Shah of Goldmines Telefilms.