Section 263 indian succession act

In India, the time limit to challenge a grant of probate is three years from the date the right to apply accrues. The right to apply accrues when the dispute arises or when it becomes necessary to apply for probate. 

 Article 137 of the Limitation Act applies to proceedings under the Indian Succession Act for moving an application for cancellation of probate or letters of administration. This article provides a limitation period of three years from the date when the right to apply accrues. 

 The applicant must justify any delay in making the application. The greater the delay, the stronger the suspicion in the minds of the court

It seems either you did not appear before  probate court or failed to raise objections regarding genuineness of will, if you could not appear due to reasonable cause then may file petition to set aside ex-parte probate order/judgment with delay condone partition.