An Indian couple is suing their son and his wife for "mental harassment" for not giving them a grandchild after six years of marriage.

Sanjeev, 61, and Sadhana Prasad, 57, told The Times of India (TOI) that they used their savings to raise their son, paying for a luxury wedding and his pilot training.

The couple is demanding Shrey Sagar, 35, and his wife Shubhangi Sinha, 31, pay compensation worth nearly £525,000 if no grandchild is born within a year.

Their son and his wife do not appear to have commented.

Mr Prasad told the paper he spent all his savings on his only son, who lost his job in 2007 and was supported financially by his parents.

The parents said they hoped the couple’s arranged marriage in 2016 would give them a grandchild to play with, TOI reports.

Mr Prasad added that he paid for his son's pilot training in the US which cost $65,000, his wedding at a five-star hotel and a car worth £63,000.

He said his son got a job at a private airline as a pilot and after six years of marriage with no child, the parents are facing "immense mental harassment".

Mr Sagar told the paper: "We are hardly left with any money because we spent everything on our son".

He added that his son and his wife live in separate cities due to their jobs.

The parents' lawyer Arvind Kumar Srivastava claimed the case was the "first-of-its-kind in Uttarakhand and probably the country".

He added that the parents' demand is "justified" and that their expectations are "not wrong".

The petition by the parents admitted by a local court in Haridwar is set to be heard by a court Sunday.