Board Thread:Speculation House/@comment-4830106-20140806180925/@comment-10390252-20140817155312

Zolnir wrote: Actually, just confirming Weiss as the heiress to the company does not deny the existence of a sibling. Why do you think that? The fact that the heir of the company has been allowed to do something incontrovertably dangerous like train to be a Huntress seems to strongly imply that she's the only child. Additionally, everything they set up with Weiss's background up to that point, such as the lyrics of Mirror, Mirror and even that throw-away line about bunk-beds just seemed to confirm she was an only child.

No matter how you try to interpret it, Blakes words are best interpreted as the sole heir. This is one of the reasons why I suspect Winter may be a step-sister.