Raja Babu is one such film. Raja Babu (Dr. Rajsekhar) is the eldest son of a well-to-do and reputable family headed by Parandhamaya (Vijay Kumar). Raja Babu has a younger brother and a sister. When Raja Babu's father dies he bequeaths a secret to him and seeks promise from his dutiful son not to reveal it. The secret is: Parandhamaya has a second wife and has sired two daughters through her. His wish is that Raja Babu should keep that a secret and still protect his stepsisters and stepmother.
Then trouble starts. People see Raja Babu with his sisters and question him about their identities and his relation to them. Unconvinced by his answers they cast all sorts of aspersions on him. Even his wife (Sridevika) turns away from him. But in the end obviously our hero silences all, for he has done no wrong and only tried to fulfill a promise given to his father.

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