The two was arrested after locals found a half-burnt body of the baby in Tamil Nadu, India.
According to Times of India,the body was found on the premises of a theatre on September 9.
Local police took the body to a hospital for an autopsy and it was revealed the baby was alive when he was set on fire.
Sniffer dogs in the investigation led cops to the door of a 22-year-old woman named Sankaragomathi who had given birth to the boy.
Tenkasi district superintendent of police G Suguna Singh spoke to Times of India and said: "She became pregnant due to an affair with a man called Shankar of the locality and the two tried to abort the foetus twice by taking tablets, but in vain.
"She delivered the baby in the house around 2 am on Wednesday."
According to authorities the grandma, Indra had wrapped up the baby in cloth and set him ablaze.
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