User blog comment:Theory of everything/Grimm Speculations Part Six: The Grimm Family Tree/@comment-206.211.150.253-20120905023252

There was no recognition on Kelly's face when she saw Renard leave Catherine's house. As far as she knew, he appeared to be 100% human and was unimportant/ unrelated to anything involving the Grimms. As for why she didn't give Nick a full report on a seemingly unimportant/ unrelated stranger (Renard): This would have seemed particularly unimportant given the fact they were dealing with time sensitive issues regarding Juliet's coma, as well as other life and death issues at the time, as well as the fact she murdered Catherine.

As for the question of why Renard was kicked out of the Royal Family: This was answered when we found out he is a bastard child. He never would have been a legitimate part of the Royal family to have been "kicked out" in the first place. I agree with "Roacher27", an illegitimate, half Hexenbiest child would not be accepted by the Royals. It doesn't matter if Royals have affairs all the time. A child produced as a result of an affair, any child for that matter and in this case it's even worse considering the Hexenbiest element, is not going to be accepted as a Royal by the Royal family.