Balakrishna has guts, but not NTR Jr?

Nandamuri Balakrishna is essaying the role of his father NT Rama Rao in his biopic that was recently launched. Similarly, the makers of ‘Mahanati’ who are filming the biopic of Savitri approached NTR Jr to essay the role of his grandfather NT Rama Rao. However, NTR Jr declined to play his grandfather’s role.
 
NTR gave the reason why he turned down the offer when producer Ashwini Dutt approached him to play a small role of his grandfather NT Rama Rao. He said actually doesn’t have the guts to play Rama Rao gaaru.
 
He is just being smart. He doesn’t want to ruffle his babai's feathers. Nandamuri Balakrishna as he is making biopic of NTR.