Ram Vir (45) and Jhamman (65), residents of Nari village, and the boy, Kanha, a resident of Pisava village, died on the spot, they said.
The 10 injured villagers have been hospitalised and the condition of three has been stated as serious, the police said.
The accident took place when they were going to Pisava from Nari to condole a death, they said.