Lala Kedarnath Prasanta (Balraj Sahni) has three sons whose birthdays are on the same day. On the occasion of their birthday celebration, they are visited by a well-known astrologer, who advises Lala Kedarnath not to be proud for his past achievements and to not be too optimistic about the future as fate (kismat) plays a key role in life. Lala Kedarnath ignores the prediction and is busy making plans for an even wealthier future. Later that night as he is proclaiming his grand plans for the future to his wife (Achala Sachdev), there is a sudden earthquake and the whole town crumbles. When Lala Kedarnath regains consciousness, his house has been destroyed and his family is gone.
The oldest son, Raju, (Raaj Kumar) ends up in an orphanage, while middle son, Ravi, (Sunil Dutt) is found on the road by a rich couple who take him to their home to raise him as their own son. The youngest son, Vijay, (Shashi Kapoor) who is still an infant, is with his mother Laxmi (Achla Sachdev). Unable to find the rest of the family, Laxmi and Vijay live in poverty.
Lala Kedarnath traces Raju to the orphanage but finds that he has run away because the orphanage manager (Jeevan) beat him up. Frustrated, he kills the manager and is jailed. As the police drive away with Kedarnath, the audience sees young Raju running in the streets and turning into an adult (Raaj Kumar).
Raju grows up as Raja, a sophisticated thief, who works for Chinnoy Seth. Raja falls in love with Meena (Sadhana) and decides to give up the life of crime. To his dismay he realises that she however intends to marry Ravi, who is a family friend. On the night before their engagement he decides to kill Ravi only to realise that he is his long lost brother. However he cannot tell Ravi about his parentage and in the mean time Meena's parents decide to break off the engagement on discovering that Ravi is of unknown parentage and religion.
Heartbroken, Ravi leaves his home after an argument with his foster parent's daughter Renu(Sharmila Tagore), whom he considers a sister, over the fact that he had objected to her affair with Vijay who is working as a driver for Chinnoy Seth. Renu has been in love with Vijay since their college days together but Vijay has not been able to find a suitable job in Mumbai despite having a BA degree. Laxmi has been diagnosed with cancer and Vijay has no other option but to be a driver.
Raja hears about Ravi's problem and decides to reveal the truth about their relationship at a party organised by Chinnoy Seth. Chinnoy Seth's employee misbehaves with Meena at the party and Raja threatens to kill him. Later that night the drunk employee gets into a fight with Chinnoy Seth and in self-defence, Chinnoy Seth ends up killing the man. To cover up he decides to frame Raja and drags the body to Raja's house, hiding it in his closet. Vijay happens to witness this but is shut up with the promise of money for his mother's treatment.
Raja is arrested and Ravi defends him as an advocate, while Vijay initially testifies falsely and then revokes his statement. Lala Kedarnath Lala also appears in court as the witness who found Raja being caught by the police. Raja is ultimately proved innocent and Chinnoy Seth is convicted after he blurts out a confession in court, thanks to Ravi. Afterwards, Laxmi arrives in the court and makes sure if Vijay did the right thing, but Lala Kedarnath appears back in the court and the family fully reunites. In the end, Lala Kedarnath and the rest of the family build a new home, and also place Meena's family and Renu's family in the home.
Did you know?
Producer B.R. Chopra had originally wanted to cast Prithviraj Kapoor and his three sons, Raj Kapoor, Shammi Kapoor and Shashi Kapoor. Eventually, only Shashi Kapoor was cast in the film. Read More