I'm actually seeing as "added as unrelated person" - shouldn't it be added "AN" unrelated person? Of course, it's an awkward message anyway, since I'm adding a son to his mother, so obviously there is a relationship there. Just weird that when I add the son by using the father as the primary, and ensure the check box is checked to add the mother as well, it delivers this unusual message instead of the expected "added child to".
Even more interesting is the Change Log, that doesn't show at all who was added. Would make it difficult to back track if for some reason you wanted to understand what had changed.