Validity os an Agreement

Hello, 1). I sold my property in 2007 to Mr. X, sighning an agreement concerning details of property and payment options.And received a major amount of payment within a year(not full amount yet).And no major clauses written on the agreement. 2). Now, in 2007 Mr. X sold or gave the possession to Mr. Y without my concern. 3. In 2007, the property was registered in my fathers name In 2013, I got registered the property in my name through HIBA (as per MUSLIM law) Does the agreement Still Valid? Can I take my property back or not..??? Plz Help.....