Zameer (1975)

Maharaj Singh is a proud owner of several derby-winning stallions, and lives in a palatial farmhouse with his wife, Rukmini and young son, Chimpoo. One day dacoits attack his farmhouse with a view of stealing the stallions, but Maharaj fights them, killing the son of the leader of the dacoits, Maan Singh.

Maan Singh swears to avenge the death of his son, and abducts Chimpoo. Years later, a servant of Maharaj, Ram Singh, brings a young man named Badal into the Singhs lives, and tells them that he is their missing son Chimpoo. Both Maharaj, Rukmini, and their daughter, Sunita, are delighted at having Chimpoo back in their lives. Then Badal and Sunita fall in love with each other.

It is then Badal confesses to Maharaj that he is not Chimpoo, but a former convicted jailbird, who was asked to impersonate him by an embittered Ram Singh. Maharaj does not want to relay this information to an ailing Rukmini, and decides to keep it quiet for the rest of their lives. But sooner or later Rukmini is bound to find out - especially when Badal and Sunita openly show their love - will this shock of an intimate brother and a sister spare her or has fate something else in store for her?