Abhishekh Bachchan, who plays a father to Amitabh Bachchan in R Balakrishnan’s Paa, says he tried imitating Big B's mannerisms. "I have given my best for the film to play father to my real-life dad. I definitely tried imitating his mannerisms," Abhishekh said at a promotional event of the film which also stars Vidya Balan. Abhishekh and Vidya play parents to the Big B, suffering from progeria, an extremely rare, severe, genetic condition wherein symptoms resembling aspects of aging are manifested at an early age. Approximately one in four million people are diagnosed with this condition.