The incident came to light at 7.30 last evening when some neighbours spotted the woman's son Jaspal coming out of his house in an injured state, police said today.
"Sensing that something was amiss, neighbours rushed inside the house and found Jasbeer and Prabhajot lying in a pool of blood. The trio was immediately rushed to a nearby hospital where doctors declared Jasbeer and Prabhajot dead," said a senior police officer.
"As per initial investigation, it seems that an insider committed the crime as police did not found any sign of forced entry into the house. Police are also scanning the footage of CCTV installed in the nearby area to identify the accused," the officer said.
"We are interrogating the neighbours," the officer said.