A 34-year-old dry cleaner allegedly killed his daughters and wife before hanging himself in southwest Delhi, the police said.
Ravinder Kanojia was found hanging while his wife Chanda and two daughters - aged 6 and 8 - were found dead on a bed in the same room.
The police said questioning of the couple's neighbours at the Kakrola village near Dwarka sector 15 had hinted that they were suffering from financial problems.
"But there may be another side to the story," said a police officer. According to neighbours, Kanojia killed his wife and daughters due to family discord.
"Investigations are underway," the officer added.