The Devil's Advocate
Call me Dad
you mean HIS last name that he still has and had before herFather making all types of business deals with that last name.
Only thing she can win in this, is if he directly promised things involving her. And it looks like he did
What she cannot do, is sue the man and then he not be allowed to use his god given name, as a business name. Copyrighting certain things is first come, first serve. A business name, that is also your legal name, is not