Just to make sure I understand you right:
You argue that the still living son of the living ruler shouldn't be the heir since the living grandson of the ruler should be more eligible as heir to the kingdom of the ruler?
If this is the case then yes, I would say it's indeed WAD since sons are "more" next-in-line than grandsons.
You argue that the still living son of the living ruler shouldn't be the heir since the living grandson of the ruler should be more eligible as heir to the kingdom of the ruler?
If this is the case then yes, I would say it's indeed WAD since sons are "more" next-in-line than grandsons.