Police sources said Partha De had been living with the remains of his dead sister and two dogs.
Samples of female skeleton, which was found from Robinson Street 'horror' house in Kolkata whose septuagenarian owner allegedly committed suicide, have been sent for DNA testing, police said today.
The skeleton of 50-year-old Debjani De was recovered along with two skeletons of dogs during a probe after her father and house owner Arabindo De allegedly set himself on fire in his bathroom after bolting it from inside on Wednesday night.
Mentally-challenged Partho De, the 45-year-old son of Arabindo, also had been living with his father and the skeletons for six months. He is now recovering in Pavlov Mental Hospital, police said.
"Samples of the human skeleton have already been sent for DNA test. Reports of the DNA test along with other reports will help us ascertain if the skeleton is of Debjani," the police sources said, adding that tests were being conducted on the human skeleton.
The police was also thinking about using a specially designed software to match the skeleton with the photograph of Debjani De to ascertain any link between them, the sources said.
The sleuths of the city police today questioned Arun De, Partho's uncle and brother of Arabindo De, at the office of DC (South) and found anomalies with his previous statement, the sources said.
During interrogation Arun De said that he used to have regular interaction with his elder brother Arabindo De, mainly on property matters. They even met in clubs.
The last such interaction between the two brothers took place 10 days before the death of Arabindo. sources said. Arabindo also informed Arun about Partho's condition, the sources said.
Meanwhile, the police is still waiting for the mental hospital's nod to examine Partho.
Sources in the city police's Detective Department said that the De family, which owned the apartment in the city's upscale Robinson Street, were entirely alienated from the outside world.
The house stands on 23 'kottahs' of land in downtown Kolkata and was built in the 1950s by the father of Arabindo De. The probe into Arabindo's death led to the discovery of the skeletons allegedly of his 50-year-old daughter Debjani and two dogs in the apartment besides Partho, who said he had been living with them for six months.