The 63-year-old "All Is Well" actor said till now he has found his son significantly decent in "Barfi" and "Rocket Singh: Salesman of the Year".
"Generally I don't like him as I am too critical and harsh but he was decent in 'Barfi' and 'Rocket Singh'," Rishi said, when asked about the best movie of his son, during a Q&A session with fans on Twitter.
The actor, who earned a lot of praise for his portrayal of Ravi Verma in 1980 thriller "Karz" directed by Subhash Ghai, does not considers the film as one his best performances.
Rishi, son of Bollywood legend Raj Kapoor, also recalled his childhood days when yesteryear gems Madhubala and Meena Kumari visited their house on Diwali, but regretted that he did not realize their importance during those days.
"When I was very young they often visited our house for Diwali etc... How unfortunate I was not realising their worth," he wrote.
The actor will next be seen in Indian comedy romantic drama film "Kapoor & Sons" directed by Shakun Batra.