What? You can't sell a noble title, it's given by the king and he can take it back. Those are the only two possibilities. And selling the property? If she sold the property, then the Uncle clearly has not paid her for it and therefore the deal has been violated by him. Seeing as she was starving in the streets. Furthermore, he was part of the conspiracy to murder her parents despite not wanting to be. Interrogating him, especially with magic, would doubtless reveal that. That's two reasons why he has no claim of any kind.