Actor Ranbir Kapoor paid a small emotional tribute to his late father Rishi Kapoor at the official poster launch event of his upcoming movie `Brahmastra` in the national capital on Wednesday. 

`Brahmastra` director Ayan Mukherjee with lead actors Ranbir and Alia Bhatt was also present at the event. After unveiling the official poster of the much-anticipated movie, Ranbir got emotional and recalled his conversation with his father about the film that was under production for more than eight years. "I miss my father terribly today. I remember during the making of the film, he kept fighting with Ayan and me and kept questioning us.