Gift deed release of charge

A gift deed was executed in 1977 by Mrs Rohini in favour of her son Mr venugopalan giving him 27 cents of land. She had put a condition in the deed that he has to give rs 1000 to each of his 9 siblings after her death. In 1987 Mrs rohini passed away and since then Mr venugopalan has been in possession of this property. He also passed away in 2009. He is survived by his wife and daughters. Now some of the legal heirs of his siblings has asked for their share in the property. The legal heirs of Mr venugopalan is unable to find any documentary proof for the settlement of the above mentioned charges by Mr venugopalan. Kindly explain wether law of limitation is valid in this case. Now the legal heirs of the siblings are asking for the present value of the land. If they go to court what amount will have to be paid to them the original 1000 along with the interest for 30 years or the present value of the land.