Guru Ho Jaa Shuru (1979)

Garga escapes from prison, determined to get even with CBI Inspector Kumar, who had arrested him. He soon finds out that the latter is on his way via train to Delhi along with his wife, Sita, and two sons, Mohan and Sohan. He plants explosives on the railway tracks, blows up the train, but is unable to kill Kumar, who believes that his entire family has perished. Little does he know that all have survived - Sita lives the life of a widow along with two males Hanuman Singh, and Suraj, who is actually Mohan; while Sohan is now known as Michael D'Costa. Shortly thereafter Michael will be killed, but he will re-surface as Sohan and will unknowingly jeopardize the life of his biological father.