The accident took place today when the family of Suresh Parmar was returning home in Ranchhodpura area here along with one relative in an auto-rickshaw and were hit by a speeding Mercedes, assistant sub-inspector of Kishanwadi police station, Nanbhai Bhagabhai, said.
The relative, Vishram Bavanji died on the spot, while Suresh Parmar (42) and his wife Bhagvati Parmar (35), succumbed to injuries in the hospital later in the day, the officer said, adding, their two children, who also sustained serious wounds, were undergoing treatment at another hospital.
Police have seized the Mercedes and has initiated a probe.
The driver (of the car) fled from the spot and hunt has been launched to nab the motorist, he added.