Pretty sure that they werent when She was introduced by Rucka.
But I can be wrong, I was just seriously surprised.
I guess I'm wrong. Rucka is against it.
Thats also why I so dislike the idea of Kate and Bruce being related. I think that her separation from that is crucial to who she is. Her independence is entirely self-defined, and she is entirely self-motivated.
But they are related now and sane goes for the Arkham verse.
I think Morrison was the one who decided that the Kane's were related to the Wayne's by marriage which happened before the introduction of Kate Kane.
This seems to be true.