The accused, who, police believed, suspected her wife of having an extra marital affair, stabbed his spouse and the children with the sharp-edged weapon.
While the minor, identified as Shivam, died on the spot, wife Surita, son Vikas (3) and daughter Parvati (1) suffered injuries and are undergoing treatment at a hospital, police said.
The accused is a labourer hailing from Bihar.
Police said a case of murder has been registered against him.
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