Mahesh is the only son of Satya Raj, a rich entreprenuer, who is so attached to family bondings and firmly believes in relationships. However, the growth of Satya Raj doesn't go well with his brother-in-law Rao Ramesh who aims to grow on his own by separating from Satya Raj. What happens to Satyaraj when Ramesh walks out? What Mahesh does to bring back everyone together and what makes him go on a journey to find his family roots - seven generations of his family - is Brahmotsavam all about.

Mahesh Babu's performance in the pre-interval sequence is the best part of the film. His slang and dialogue-delivery are apt. He slips into the role effortlessly. 

Between Kajal and Samantha, the latter takes the cake.  Kajal looks gorgeous and plays the role of a modern woman who experiments with aplomb.  But right from the word go, Samantha is brilliant in her body language.  She is confident and wears that innocent expression apt for her character.  Pranitha looks vivacious and that's all.  She has no much scope to perform, once again.

Overall brahmotsavam is a film that drives home the message that relationships must be celebrated.  Only that the idea is stretched into a feature film.