What Chiru and Nag think about their Sons?

It is often a proud moment for a father when his son/daughter achieve something great. And when it comes to celebrity fathers, it is natural that their happiness is doubled if their children achieve something. This gave rise to an interesting thought among few on Chiranjeevi and Nagarjuna. 
What are their reactions as a father on Ram Charan and Naga Chaitanya's achievements? Many say "Both must be feeling happy and proud. But Chiru finds it difficult to express, he speaks as if he is a competitor to his son forever. Basically, by doing that, he wants to keep Charan grounded." They add "As for Nag, he flashed his cool cucumber smile when Chaitu achieves something good. He has a very neutral reaction to it but inside, he must be beaming with a lot of pride at his son's achievement in such a young age. It is all on how we assess his smile." Overall, the common opinion is, both Chiru and Nag are happy but they have their own style of expressing it.