t's soon going to be officially celebrated as the only film in the world featuring the father-son duo reversing their real-life roles for the screen.

Real-life father and son Amitabh and Abhishek Bachchan are all set to enter the Guinness Book Of World Records for being the only father-son acting duo to have played reversed roles on screen in Paa. It's also the only instance of a 67-year old actor playing a 12-year old child and a 31-year old actress playing mother to a 67 -year old actor.

Director Balki admits Paa is pretty much a hotbed of unprecedented occurrences. "You know, while casting and all through the shooting, I never sat back to consider the uniqueness of the casting. It was only the people all around me who seemed to be constantly conscious of the casting oddity. To me Amitji, Abhishek and Vidya were playing the roles I had in mind for them from the start. But now, I do see that the casting is exceptional. It hasn't been done in any part of the world. So yes, plans are afoot to enter Paa into the Guinness book in various categories."

The necessary moves have already been made and Balki would make sure that Paa gets noticed in the right categories as soon as release of the film is out of the way.

After Paa, he plans to take a bit of a vacation and let his wife Gauri Shinde direct a film for his production house.

"Gauri has been a part of my creative processes for many years now. We got married two years back. The film she wants to make is very different from what I do. Her script has a flavour that's totally removed from mine."

None of the Bachchans are likely to figure in Balki's wife's directorial debut. But Balki intends to make his third film with the Bachchans, this time making sure that Mrs Jaya Bachchan too has a part.