Talk:Royal Families/@comment-190.164.129.33-20170509180926

I'm living in Chile, so I don't have easy access to all the seasons of Grimm. I've been rewatching from the beginning to refresh my memory and I'm at S3. Here's what I don't get: Royals are, basically, regular humans with political pull in the wesen/Grimm world, right? But there seems to be a genetic or biological component to being a royal, because when they tested Diana to verify that she was a Royal, her blood turned blue. Has this been addressed? Is there something extra special about these humans? Or is it just a sort of DNA test that they ran?