The car was completely charred following the incident which took place at around 10 pm on Sunday on Mumbra bypass when the family members were on way towards Thane city, local civic body's disaster management cell chief Yasin Tadvi said.
The car suddenly caught fire following which its occupants - two women, as many men and three children- immediately got out of the vehicle, he said.
Local firemen and disaster management cell team members rushed to the spot after being alerted and put out the blaze in about half-an- hour, but the car was completely charred, the official said..
The cause of the fire was under investigation, he added.