Did he have the Royal tag, cause otherwise family links mean nothing in the game world for gaining the title of Royal. Sure in the realm world he would have been royal by family ties, this does not hold true for the BM world in my opinion.
It used to be that family links *do* change things, I clearly remember reading this on the wiki. However, the conditions for this being granted are a bit hazy. That is, he probably needs to have been in the realm before the other become ruler. This might have been removed several years ago, though, I couldn't say.
