Allu Arjun is known for his love towards his father, Allu Aravind. He never ever talks anything bad about him or never let's anyone talk even anything remotely bad about him.
He respects him and the love they both share has been a great example of how a father and son, duo can work in any situation. They slowly were able to help their friends and many new directors and writers to develop under their big production house.
In return, the writers and directors delivered good films that made Bunny what he is today. The actor in him as also come out because of careful decisions by Allu Aravind and being a pillar of support to Bunny.
So, on his father's birthday, Bunny with his family knocked on his father's door with a cake and the entire family celebrated the birthday of their head. We can see how pleasantly surprised Allu Aravind is and Allu Arjun with his boys and wife, completely involved in the celebrations. A great family moment, isn't it?