Without specific details on the plot, one can speculate that "Mardana Sasur 3" likely explores themes of familial relationships, societal norms, and possibly gender dynamics, given the title's suggestion of a familial or relationship-oriented storyline. The film, like many of its contemporaries, might use the short film format to say something significant about the human condition, relationships, and the challenges faced by individuals in navigating complex social expectations.

Meet Rajesh, a progressive and open-minded father who defies traditional norms. He's a 55-year-old widower, living with his son, daughter-in-law, and their young daughter. Rajesh's late wife was his best friend and partner in every sense. After her passing, he decided to break free from societal expectations and live life on his own terms.