The prosecution's case was that, two years ago, at Madukkarai here, Govindaraj repeatedly sexually exploited his 17-year-old step daughter, born to his second wife, after his first wife left him.
After some time, the girl was rescued by one Saravanan, a relative of Govindaraj, who placed her in a hostel and helped her to continue with her studies.
But with his step-daughter away, Govindaraj began sexually harassing his 12-year daughter, the prosecution argued.
Meanwhile, based on a missing complaint filed by Govindaraj, police traced the step-daughter, who told them her reasons for leaving the house.
Delivering the verdict, Madhila Court Judge MP Subramanian awarded two life terms to Govindaraj, which will run concurrently.
Though the step-daughter had revealed that Saravananan had also raped her and a case was filed in this regard as well, he was acquitted due to lack of evidence.