A 32-year-old man allegedly strangled his wife and two-year-old son to death before hanging himself at his Vikhroli residence in Hanuman Nagar on Friday morning.
No suicide note was found, but the police suspect that he was facing financial problems and was under pressure.
This was the third incident in two months when a "depressed" parent committed suicide after killing family members.
Sanjay Sen, who had started a garment workshop four months ago with his landlord Mangesh Ambekar, had not paid his workers for the last two months and he was stressed about it, one of his employees reportedly told the Parksite police.
At 9.30am, the landlord's son went to the Sens' residence to play with two-year-old, Tejas. When no one opened the door, he peeked through the window and saw Sanjay's body hanging from the ceiling fan. He ran home and informed his parents.
Ambekar then called the police, who found Sanjay's body hanging from the ceiling fan, his wife Pooja's body on the floor and Tejas on the bed.
Both Pooja and Tejas had strangulation marks on their necks, said Sanjay Shintre, deputy commissioner of police (zone 7).
Sanjay and Pooja, who worked in the same zari manufacturing unit in Subhash Nagar at Vikhroli, fell in love and got married three years ago.
Pooja was then living with her elder sister in Subhash Nagar.
After marriage, the couple rented a room at Hanuman Nagar. After Tejas was born, Pooja stopped working.
"Four months ago, Sanjay and Ambekar started a garment manufacturing unit, Sai Art. Ambekar had invested the money while Sanjay was managing it, but the business did not take off. Sanjay could even pay his employees. He was stressed; he did not want to ask Ambekar for more money," said an officer from the Parksite police station on condition of anonymity because of protocol reasons.
The Parksite police have informed Pooja's parents who live in Dhapoli.
"We don't know the reason behind the deaths. Two months ago, the families had met for Pooja's brother's wedding at their hometown. She looked very happy. She never told us any problems," said Pooja's brother-in-law Dinesh Bente, who lives in Vikhroli.