The incident happened at Rabanbar village under the jurisdiction of Ranaghat police station on Friday night, a police officer said.
Baidyanath Biswas (70) had sold some trees for Rs 90,000 and his son Abodh Biswas wanted his share.
Abodh allegedly poured petrol on his father while he was sleeping and burnt him to death.
His mother Saraswati Biswas received burn injuries while she made an effort to save Baidyanath Biswas.
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While his wife was sent to Kalyani JNM Hospital, Abodh was admitted to the Ranaghat Anulia Hospital, the police officer said.
Later, Baidyanath's other son Subodh Biswas lodged a complaint against Abodh at the Ranaghat police station.
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