Mohan, an employee of State-run TANGEDCO, his wife and their 23-year-old daughter were found lying in a pool of blood at their house in a village off Tiruppathur near here, they said.
Mohan's 22-year-old son, who was rushed to a government hospital, is battling for life, police said.
All the three deceased had sustained serious stab injuries besides wounds that looked like being inflicted by a heavy object, they said.
Police said a case has been registered a probe was on and several persons were being questioned.
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