According to police, the incident took place on the ground floor house in Ambedkar Society in suburban Vikhroli due to leakage of gas from LPG cylinder at around 11.30 am.
The occupants - Vimla Chavan (50) and her daughter Swapnali (20) - received 85 per cent burn injuries, while her 17-year-old son Aniket sustained 30 per cent burns.
Giving details of the case, senior inspector of Park Site police station Rajendra Kulkarni said, "While preparing food this morning, Vimal Chavan found that her gas cylinder has turned empty. She then borrowed a cylinder from her neighbour."
While Vimal and son Aniket were admitted to Rajawadi hospital, her daughter Swapnali was later shifted to Kasturba Hospital from there, Kulkarni said.
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Another person Devman Singh (55), who runs a shop in the vicinity, received 80 per cent injuries while trying to save the Chavan family members. He has been admitted to Sion Hospital. A youth -- Saurabh Chavan, who lived in the vicinity, also received 25 per cent burn injuries in the incident, they said.
Vishal Nagvan (25), Vijay Sawant (37) and Meera More (65), who were injured in the fire mishap, were discharged after first-aid, the officer said.
"Safety engineers from Hindustan Petroleum were called in to check whether the regulator of the cylinder in question had been fixed properly or if there was some inbuilt fault in it," Kulkarni added.
On Friday, eight persons were charred to death when a blaze broke out in Hotel Kinara in suburban Kurla.