Well son vs grandson.. don't think Balayya would try to go wrong playing his dad here considering he's among the ones to spend the most amount of time around his dad. Ofcourse he did not take any of his dad's leadership qualities though. None of his children or grandchildren did.
As for the film... How ideal it is to cut it into 2 parts. First part exclusive to NTR the cinema legend. Second part exclusive to NTR the political legend/god. Ooh the INC will not like the second part for sure.