The 51-year-old man, a textile industry worker, and other members of the family mixed poison with non-vegetarian food last night and consumed it, police said.
They fell unconscious and neighbours noticed them early this morning and informed police.
Though police rushed them to the Perundurai government hospital, the father and daughter were declared brought dead. The condition of the 25-year-old son is said to be critical, hospital sources said.
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