The accident took place on National Highway-55 when Kamal Panda (35) was travelling in his car along with his wife Sasmita (28), son Pravin (5) and 18-month-old daughter Mahima and father-in-law Pitabas Panda (65).
On its way to Bhubaneswar from Hirakud, the car rammed into the oil tanker head-on killing Sasmita and her father on the spot.
Kamal and Pravin were taken to VSS Medical College Hospital in serious condition.