Pilot Premnath

Pilot Premnath is a 1978 IndianSri Lankan Tamil film directed by A. C. Thirulokachandar, starring Sivaji Ganesan as the eponymous character. It was an IndoSri Lankan jointventure produced by D.M Chandrasena, T. M. Menon and M. M. Saleem.

The deceased wife continues to live in Premnaths heart, and every time he returns from a flight journey, he goes to their room, and sees her in his minds eye. Once while talking about her in the room with his copilot Thengai Srinivasan, he shows him the bundle of her letters. One letter is found, not posted. In it, the wife states that one of the three children was not born to her.The world around him shatters and it is then he breaks into the song Who Is The Black Sheep? The suspense is revealed later. Premnath goes to America for training, leaving his pregnant wife behind. She delivers a stillborn child. Simultaneously, his friend Balus Major Sundararajan wife gives birth to a blind baby girl and to prevent tragedy in Premnaths family, Balu substitutes his baby with Premnaths. ........

Source: Wikipedia