A man hanged himself after coming home to find his wife and daughter had killed themselves in a suicide pact two days previously.
Engineer Indrajeet Dutta, 50, came back to his home in the Kamothe area of the city of Navi Mumbai in western India’s Maharashtra State to find the bodies of his wife Dr Jasmine Patel and daughter Oshin, 15.
Dr Patel, 45, left a suicide note citing a chronic medical condition as the reason for ending her life.
Police commissioner Hemant Nagrale said: "She said she didn't want to leave her daughter behind, and so had made a suicide pact. She expressed her wish to donate both bodies to KEM Hospital for research."
Mr Dutta then left his own suicide note and hanged himself. It was not clear how Dr Patel and her daughter had killed themselves.
As well as Dr Patel’s unspecified medical problems, police said the family had other difficulties.
Officers discovered Oshin’s diary, which spoke of blazing arguments her parents would have over their finances.
Oshin also lamented "the mess" her life was in as she had become so overweight that she could not walk without a stick.
The building’s security guard said he had not seen Dr Patel go to work at the clinic she ran for five months.
But despite this and hints of money problems in Oshin’s diary, the family’s landlord said that they were up to date on their rent.
Police said that the suicide notes’ handwriting would be verified by experts but that they were not treating any of the deaths as suspicious.
The family’s cleaner discovered all three bodies two days after Mr Dutta’s death.
The bodies are still in the mortuary at Mumbai’s Vashi Municipal Hospital as police have so far been unable to track down any of the family’s relatives.