Ancestral property sold - Can i get it back?

Dear Sir/Madam, My family has 4 ancestral property, and all the 4 properties are in my father's name. My father sold one of the 4 properties 6 months back without my, my brother's, my mother's consent. I and my brother wanted that sold property back, we are ready to pay the current value of that property to the one who bought that property. My questions are (1) Does my father has all rights to sell this property. Though it's ancestral property, the property is registered in his name(NOT SELF ACQUIRED PROPERTY) (2) If Question 1 is NO- He can't sell, then can I file the case and get stay order? (3) What are the chances that I'll get back the property (4) If I get back the sold property back by winning the case, do I need to satisfy all the demands demanded by the one who bought our property or is it enough to pay for the amount he bought the property or the current value of the property?