Shekhar's (Raj Kapoor) maternal grandmother Nani (Lalita Pawar) is a very loving person, and loves Shekhar dearly as a mother. She is also very religious and firm in her beliefs. She believes that every man must have a male heir to carry on the family's name. Therefore, she will only permit Shekhar to marry a woman who will bear him a son. Shekhar presents his Nani with Sunita (Waheeda Rehman), the girl he plans to marry. Nani finds out that Sunita cannot bear any children and disapproves of her. Shekar and Sunita marry anyway, and to pacify Nani, pretend that a friend's son is theirs.

All the songs picturized on Raj Kapoor were sung by Mukesh, whom Raj Kapoor used as his singing voice, Except in one Song (Tum Hi Tum ho). It happened one day that Mukesh was unavailable for a song recording, So Mohammed Rafi was called for a dubbing version of the song. Raj Kapoor was so impressed that he used this dubbed song of Mohammed Rafi in the Film. After hearing the song, Mukesh too quoted that the way Mohammed Rafi has sung, he couldn't have rendered in that beautiful and melodious way.

The original female lead was Madhubala. Shooting had started with her in 1959, but her heart ailment curtailed her career and she left the film incomplete. Her portions were entirely reshot with Waheeda Rehman replacing her.

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• Ek Dil Sau Afsane on IMDb