benami property purchase in the name of relative 40 yrs of p

We had purchased benami property some forty years back in the name of maternal relative as we were joint faimily at that time.The said relative eventually died by committing suicide and now after 40 years his widow is trying to evict us and filed a mutation application in the office of Circle Officer.We 3 faimilies are living in the said property for 40 years and have our business and everything there.We have all the original documents sale deed papers proof of payment correspondence from the seller and all with us as we were the actual purchaser and in posession of the property.All the relatives of the lady as well as the seller are aware of the fact and ready to support us.Please guide as to what course of action should be taken at this situation and what is the procedure to get the title in our name in this case.