Prabhu acted in an unqualified remake of his father’s superhit Manohara. Name the film.

Soorakkottai Singakutty.
It was telecasted in K TV today morning and I was surprised and very amused to see the climax (Prabhu chained, and his mother, played by Vijayakumari, crying out à la Kannambal) being flicked directly from Manohara. This film, produced by the AVM (its banner was shown at the end of the film), is supposed to be a modern adaptation of the original film, but looks like an out-and-out B-film.
It seems the film was directed by Rama Narayanan (Source. It also mentions that the film was produced by AVM Kumaran after he moved out of the AVM banner.)
The only redeeming factor is the beautiful song “Kalidasan Kannadasan” sung by Jayachandran and P. Susheela.