As per Met Life's Met Suvidha (Par) Policy Brochures - The Guaranteed Surrender Value depends on the way life insured pays his premium -

A- For Single Pay
If the policy has been in force for 2 years, the policy would acquire a Guaranteed Surrender Value. The Guaranteed Surrender Value would be payable from the end of the second year onwards, and would be equal to 90% of the premium paid, excluding any extra premium and rider premium, if any.

B- For Regular Pay and Limited Pay
If all premiums have been paid for at least 3 full years, and the policy had been in force for 3 full years, the policy would acquire a Guaranteed Surrender Value. The Guaranteed Surrender Value will be payable from the end of the 3rd year onwards and will be equal to 30% of the premiums paid, excluding first premium, any extra premium and rider premium, if any.

In your cousin's case the second option 'B' will be taken into account.