My illiterate GrandFather purchased a propery frm Mr.X in seventies in gujarat but due to lack of knowledge he only made the agreement but didn't registered in goverment and paid propery tax in the name of Mr.X, My GrandFather and Mr.X was neighbour cum friends. My grandfather passed away in 2009 and Mr.X is now too old and almost MAD, Mr.X's sons have sold same property to another party Mr.Y. who is a danger person. Now both Mr.Y and us has an agreement of the same property. Is there any chances to get the property back if we are ready to pay the panulty for not registering the property?