The police have taken the boy's mother and her nephew into custody in connection with the incident.
Macherla Vinod (25) of Ramanjaneya colony, an auto driver, had fallen in love with Dravida Tejeswani (17) of Chamanbasti in Kothagudem two years ago.
Apart from grave burn injuries in which the skin is damaged, extensive gashes endured in accidents or fractures also require skin grafting.
Doctors of government hospitals were busy on Deepavali with several cases of firecracker burn injuries.
Five-year-old Chetan Sai, who was set ablaze by his father in Thalaghattapura on Sunday, succumbed to his injuries on Monday.