Police officials are suspecting that someone known to the victims might have killed them, since, till now, there is no evidence of forced entry into the house.
It is suspected that the killings could be a fallout of a property dispute, they said.
The deceased have been identified as Urmila Jindal (82), her daughters Sangeeta Gupta (56), Nupur Jindal (48) and Anjali Jindal (38) and their security guard Rakesh (42), the police said.