Maybe there will be a quest where you can turn Rathazul female like you did Arian, then you breed him/her so that your children (with amily) won't be having brother/sister relationships.
Well amily did say her father was an alchemist if I remember right, and Rathazul is about the proper age and profession to be one, but I think that would be kind of awkward to be banging amily in front of her own father...
Well this explains why there hasn't been an update for CoC in many a fortnight. Also I think this mod needs a bug report thread to compliment it, especially for some of the more alpha and beta content.