User blog comment:Theory of everything/Grimm Speculations Part Six: The Grimm Family Tree/@comment-50.90.228.226-20120821095024

Yes, Kelly did see him leave the house but that is not proof that she knows who he is. She could have just assumed he was an unimportant visitor. This is supported by the exchange between Kelly and Catherine at the end of thier fight. Kelly was not aware of the fact that there was a 'prince in portland' until Catherine told her so and even then, did not know who this prince was.