The poster for Paa calls it “A Very Rare Father-Son, Son-Father story.” It’s a rare father and son story where Abhisheck Bachchan plays the father of a 13-year-old boy with progeria. And who plays his prematurely aging son? His real life father, Amitabh Bachchan. Todd at 4DK has more. The Economic Times interviews Abhishek Bachchan here.