User blog comment:Derrmann/Red Like Roses fills my dreams and finds me/@comment-3387274-20130919131153

if you were so inclined we had someone dead from day 1 "fills my dreams and brings you to the place you rest" is not likely somebody taking a nap after all.

My guess is this is Ruby's personal theme, alluding to stuff that hasn't happened yet, while the lyrics of the orriginal refer to all the characters in brief.

If you want a less dark guess, I'd suggest taking somebody for granted might not be their presence but their absence. Neither Ruby or Yang ever talk about their mum, and neither of them seem to comment on their difference in appearance. I'm overeaching heavily here, but it could be that Ruby simply hasn't thought about something or someone closer to home. In any event, it doesen't necessarily imply the deaths of anyone on the main teams, something I've heard speculated a lot already.