before purchase of property you must do due diligence . ask legal heirs of deceased owner whether said owner died intestate or left a will . if he left a will was it registered or not . if it is registered document you can take search from sub registrar office .
if it is unregistered will and probate has been applied for you can check court records . if he died intestate has succession certificate been obtained . ask legal heirs to give in writing said details on an affidavit