The police said the post-mortem was not carried out due to unavailability of any other relatives to give consent for it. They said they would wait for relatives to come in the next 72 hours.
It is suspected that Sood died of malnutrition around three-four days ago. His two younger siblings, Harish and Kamla, both said to be mentally disturbed, Deputy Commissioner of Police (West) Vijay Kumar said.
He said a security guard posted at a neighbouring quarter called him and informed him about the foul smell coming from the quarter of retired scientist Yashvir Sood.
The neighbours had noticed the foul smell earlier but did not raise an alarm. It was only yesterday when the stench became unbearable that one of them alerted their guard, who in turn informed Kumar.
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Kumar, who was posted in the locality for the last six years, told the police that when he attempted to enter the house, Sood's sister did not let him in.
"When I tried to talk to his sister, she turned me away. Then I informed the police. I took the police team and some neighbours to their house," Kumar said.
Sood had retired as a principal scientist from Pusa Institute's nuclear science department on March 31 at the age of 62 and was living with his two younger siblings, both in their 60s, at an abandoned government quarter, he said, adding that the police could not trace any other family member.
The police have learnt that Sood was an alcoholic and was under severe depression before his retirement.
Kumar said that Sood became a recluse after retiring.
"When he was in service, I used to see him outside and sometimes, he also spoke to me. But after his retirement, one would rarely see him outside," he said.
The siblings mostly kept to themselves and did not interact with their neighbours. They had been living there for a long time and were unmarried. Locals, however, claimed that Kamla had got married but she had left her husband and returned to living with her brothers.
Sood's siblings have been admitted to the Institute of Human Behaviour and Allied Sciences (IHBAS) by the police.
Similar incidents have been reported in the past where people were found living with the bodies of their relatives.
In July, a 70-year-old mentally challenged man was today found living, for almost a week, with the body of his younger brother in northeast Delhi's Karawal Nagar.
The incident was reported to the police after neighbours noticed foul smell emanating from the house where the duo stayed.