His father Tej Bahadur Yadav, who was dismissed from the force after he posted a video online complaining about poor quality food being served to the troops in 2017, had gone to Kumbh mela in Uttar Pradesh, police said.
His mother was also not at home when the incident took place, they added.
Police said as per the statement of Tej Bahadur Yadav, he had hidden his licensed weapon in the house but his son somehow traced it out.
The bullet probably got fired when his only son was fiddling with the pistol, they said quoting the statement of the father, who returned home Friday morning.
Police said inquest proceedings under section 174 of the Code of Criminal Procedure have been initiated in the case.
Tej Bahadur Yadav had posted the video online complaining about poor quality food being served to the troops on icy heights along the line of control in Jammu and Kashmir. He was later dismissed on charges of indiscipline.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)