Legal Question in Real Estate Law in Tennessee

Not likely. A deed is simply a contract. It's an important one, but in the end it's simply a contract. A contract that is entered into at a time when the grantor/seller is incompetent can be set aside upon a court's finding of incompetence at the very instant of executing the deed. That's a pretty stiff burden. In order to prevail you would have to have an expert to testify that you were incompetent at the time the deed was signed. It's difficult for me to imagine a scenario where an expert would support that position simply because you may suffer from bipolar disorder.