The film will also be the Bollywood debut of actress Saiyami Kher, the granddaughter of yesteryear's leading actress Usha Kiran and niece of Tanvi Azmi.
"The kind of hard work Harsh puts in is incredible. We all work hard, but he is very idealistic about his work. He is very intelligent and sharp. He will go a very long way," Sonam told PTI in an interview.
"Mirziya" is inspired by the love tale of Sahiban and Mirza, and is described as its contemporary adaptation. The screenplay of the film is written by Gulzar.
The "Neerja" actress, who is known for speaking her mind, said in her family they all have been given freedom to evolve and have their own opinion.
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"He (Harsh) will do different things (in films). We all have been brought up with a strong sense of individuality. We have been given space and freedom to evolve," she said.
"I don't listen to him (Anil Kapoor). I don't listen to anybody. I do take his advice, but it is up to me whether to take it or not. I would rather not have them involved in my professional life as I think it is not fair," she said.
Anil Kapoor had once candidly mentioned that with three actors (he, Sonam and Harshvardhan) in their home, there is in-house competition.