My Mother had left a property for me and 2 siblings without any will and she had expired 4 years back and now we 3 had childrens had decided to seel the property . we have only the sale deed document of our property , Property tax book paid till date, water tax book paid till date and Electricity bill paid till date. the Prospective buyer asks for teh Parent document as of now which we dont have now, kindly advice what all the documents to be submitted by ud to the prospective buyer as per law,