The bodies of Gouri Bhattacharya and her son, Dipak, were found lying in a pool of blood on the first floor of the house in the city's Behala area, said Kolkata Mayor Sovan Chatterjee
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The victims had been killed by slitting their throats.
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The bodies of the domestic help and an attendant were lying on the ground floor.
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Chatterjee said it was a case of cold-blooded murder.
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Dipak Bhattacharya ran a cable TV business and cops will probe to find out if the killing was out of professional rivalry.
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Senior police officers had rushed to spot.
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