Board Thread:General Discussion/@comment-3257939-20131104060426/@comment-16502426-20131110002525

Nothing is confirmed other than that they're not genetically sisters. So either of them could be adopted, both could be adopted, or their parents could have remarried.

I think the idea that Ruby is adopted comes from Red Like Roses Part II, since it seems to imply that Ruby lost someone close, and the connection is being made that that may have been a parent.

Then we have this song, which appears to support that theory.

So I think that Ruby definitely lost her mother. Whether or not her father was still there is another question. If she had been an orphan, why wouldn't she have gone to live with a relative? So I think it is possible that her father is alive, and remarried.