The accused was identified as Arjun Parmar (35).
Inspector Y R Chauhan of Waghodia police station said that Arjun had a heated argument with his father Govind (65) after which he set the house on fire last evening.
Govind, who was very weak, could not escape and died in the fire.
Fire brigade vehicles of Vadodara municipal corporation were rushed to the spot.
Arjun who fled from the spot was arrested this evening.
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