Bhuri Devi along with her children, Arvind (6), Payal (3) and 6-month-old Munna were in the house in Patan area when it caught fire.
Neighbours tried to douse the flames but the children were charred to death on the spot and Bhuri Devi died on way to hospital in Kushalgarh, police said.
Reason of the fire is not clear and the matter is being investigated.
The bodies have been shifted to a hospital mortuary for postmortem, the police added.