Why Allu Arjun didn't attend brother's event?

Allu Sirish, the younger brother of Allu Arjun, has been trying to get a name as a star. Although his earlier movie 'Kotha Janta' was a decent hit, he has not gained stardom. Nor he was appreciated for his acting skills. He is hoping to get both stardom and recognition for his performance with his upcoming release 'Srirastu Shubamastu' since the movie's trailer has generated good buzz.

'Srirastu Shubamastu' is set for release on 5th August. The movie's pre-release event was held on Sunday. Chiranjeevi graced the event but his star brother Allu Arjun was absent. Why Bunny is not promoting his younger brother's movie. Or has he plans to do so after the release?