Board Thread:Speculation House/@comment-1996340-20130815235115/@comment-198.1.0.221-20130921173222

Like most of the comments here I believe it is Ruby's mother. I think that Ruby's mother died, possibly killed by grimm, and that she may have never known her dad, or he died even before that. This left Ruby's mother as a single parent and the most important person in Ruby's life. When she died, Ruby was adopted by the Xiao Long's. This means she grew up with them as her family, Yang as her sister and Yang's parent's like her own, yet she never forgot her real mother and still visits her grave. This would also explain why Ruby mentions Dad more than their mother. Ruby couldn't really remember or never new her father so she just gained one, but her new mother, no matter how much they care for each other, cannot replace her original mother, so there is the occasional, possibly unintentional, difference there.