It is presumed that one of the 5 daughters is mother of the grandson and is alive. In the absence of any will the mother will be class 1 heir and the son Class 2 heir. Each of the 5 daughters including the mother of the boy will have 1/5 share in the property. The grandson is not heir when his mother is alive. If the 5 daughters abandon their shares, whether the property will go to the particular grandson is not sure. Other grand-children of the deceased may have claim. If the 4 daughters abandon their claim, the fifth daughter, who is mother of the grandson will get the estate. There are cases like that. If the 5th daughter also abandons the claim, will it automatically go to the particular grandson? It is doubful. When there are a number of co-parceners if some of them abandon their claim, the property will go to the remaining ones. There are Bombay High Court decisions that there will be only nominal stamp duty for deed. If the witnesses to the lost will are available and if they are willing to testify in a court of law, it can be tried.