Dharm Singh (50), his daughters Reshamwati (22) and Mayawati (16) were killed in the mishap in Bhadai village last night, Sub-Divisional Magistrate Harishanker Yadav said.
Singh's son Gaurav (6), daughter Kanti (7), two neighbours Lalu Singh and Guljari Lal were injured in the incident and have been admitted to the district hospital.