Is Stamp duty charged on Relinquishment deed in regard to property

My grandfather died in 1996. He had two sons and four daughters. Out of the two sons, one died after him. Hence died son's six heirs were added in the list. Six heirs of died son - his wife, two son & three daughters. Now four daughters of my grandfather & three daughters of his died son want to release their rights to the property by way of hakka sod document. How much stamp duty will be charged. Please advise.