Ariyappedatha Rahasyam (1981)

Sreedharan Thampi, a smuggler with a businessman facade, continues in his womanizing ways despite being married to Santha, one of his early preys. Another of his victims, Sarojam, vows to raise her child alone. She in fact has twins, one of whom becomes a CID officer assigned to bring down Thampi's evil empire and the other, the loyal man Friday of Thampi's worst enemy. The rest of the story details how Thampi's own children plot his downfall.