The incident occurred in the morning hours when Ilaba Jagdishsinh Jadeja was pouring kerosene in the stove, said police sub-inspector K K Suthar.
Ilaba and her sons Mitraj (12) and Divyaraj (six-months-old) suffered extensive burn injuries and died before they could be taken to hospital, he said.
A case of accidental death has been registered in this regard.
