One has to be careful while entering into a property transaction. A clear and marketable title is first thing to look into. Unfortunately you took a hasty step while buying the property. The property was not in seller's name as it appears that her father was owner of property. Any release deed at this stage from her siblings even they are located shall have no value. The perspective buyer would not like to buy the property which is yet to be mutated in your name. In my opinion the step taken by you to notify in the newspaper shall not give you any advantage. The Registrar/ Sub-Registrar shall not register the sale in your name on that basis. All the legal heirs have to agree to sell/transfer the property in your name afresh.