User blog comment:TheNewProtagonist/Beware, Winter Schnee speculation is coming.../@comment-3387274-20140813183430

if Weiss always wanted bunk beds as a kid, then it is simple enough argument that Winter simply hadn't been born by then, which would also resolve the heiress issue. And they could have had seperate rooms or wings whichever one was older. Though of course, the point about inheritance is valid, and that kinda leaves it impossible to be certain which one is the elder at this stage.