The incident took place at Musapur village under Sarairanjan block in the district where the woman and her daughter were drenched in kerosene before being set afire, Superintendent of Police, Samastipur, Deepak Ranjan said.
An FIR has been lodged on the basis of complaint of victim's father who has named her daughter's husband, father-in-law, mother-in-law and brother-in-law as accused.
The Nitish Kumar government has launched a campaign against dowry from Gandhi Jyanti day this year.
Police have taken away the bodies for post-mortem and the SHO of the police station concerned has been asked to arrest the accused, who have fled their home, at the earliest, the SP said.
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