The family was returning from a wedding ceremony last night when the accident occurred, they said.
The owner of the unknown vehicle fled from the spot, the police said.
The deceased were identified as Rinki (32), wife of Deepak, her daughter Sunairi (6), son Riyank (22) and Deepak's mother Nirmala (52), they said.
Deepak's condition is critical and he has been admitted to a hospital, the police said.
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