Apparently peeved with frequent quarrel in her family, 30 year-old Sheela Devi, wife of one Satya Narayan Mahto, with two sons Rajkumar Mahto (9) and Vikas Kumar Mahto (6) set themselves on fire at Ramauli village, Deputy Superintendent of Police Anjani Kumari said.
All of them died on the spot and the bodies have been sent for post-mortem at a government hospital.
A probe was on to find out the exact motive behind the incident, the DSP added.