If they are not suing you for money but only to quiet title and you have no interest in this property (in any sense: i.e. no legal interest in it and no desire try to fight for it somehow), then the best way to handle it is to show up to court without a lawyer and simply explain on the record what you explained here, in some more detail. Make it clear that you are not opposing AND that you have not been an owner of the property for years (and so you don't even know why you are there). The judge can issue the necessary order for title since you are not opposing, but can do so in a way that makes it clear you had no interest in and no liabilty for the property. Bring any relevant documentation regarding yoru bankruptcy and when you transferred or lost title.