Rishi Kapoor can't stop smiling. His son Ranbir's "Wake Up Sid" has got an overwhelming response from audiences and critics alike, but Kapoor senior is cautious and says his son will have to continuously prove himself as it is not the surname but one's performance that ultimately counts in the film world.

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"Just being a Kapoor was never going to be enough. Ranbir had to show his worth as an actor. I also had Raj Kapoor as father, but it has never been easy for me even till date. For the last 40-odd years, I have been proving myself. The same would always hold good for Ranbir. It's a never-ending journey," Rishi, who belongs to the third generation of the Kapoor family, said.

At the same time, he is unable to conceal his excitement with the positive reviews and appreciation coming his son's way.