The 33-year-old actor plays Amol Arte, a young politician and MP from Lucknow in the film, which is releasing on December 4.

"I have modelled my look after Sachin Pilot and Milind Deora. There were no special efforts taken for my look in the film because we wanted to keep the character as normal as possible," the junion Bachchan said.

Abhishek essays the role of reel father of his real-life dad in the movie, which he says is a role of lifetime.

The 67-year-old superstar plays a 13-year-old child suffering from progeria in the film, a rare genetic disorder which accelerates ageing.

"This is a role of a lifetime. Very few actors get such an experience and opportunity... especially a son to play father to his own 'Paa'. We are only and perhaps the first actor father-son duo to have played themselves in a role reversal," Abhishek says.

"We wanted to maintain the uniqueness of Dad's look in the film and did not want to overload it with different types of looks for other characters," the actor says.