He died at the end of that month, the same day as his mother.
9News.com.au has contacted the Department of Foreign Affairs for comment.
Mr Khanna is one of three Australians to have died of coronavirus in India in recent weeks.
Sydney man Govind Kant, 47, died of coronavirus, also in New Delhi. Mr Kant had returned to India for his mother’s funeral.
An unnamed 59-year-old permanent resident has also died of the disease in India.
India’s new infections of coronavirus have declined to 267,334 in the last 24 hours, down from a week of more than 400,000 cases a day.
But the country hit a record number of COVID-19 deaths, with 4529 dying in the past day.
Both figures are considered to be undercounts.
A repatriation flight which landed in Australia on Saturday was half-empty, because so many planned passengers had tested positive to the disease.
Twenty five million people in India have contracted coronavirus, second only to the United States in the total infection rate.