Kalyan Biswas and his wife Jayanti (50) consumed poison in the roof apparently on Thursday after their daughter-in-law left for her parents' house following a quarrel with the couple.
Her husband Surajit works as a mason in Kerala.
The deceased couple's younger son Prasenjit had thought his parents had gone to the temple or some relative's place as they used to do often, the police said.
A neighbour found the bodies lying in the roof today and informed Prasenjit, the police said.