Board Thread:Speculation House/@comment-3257939-20131111020445/@comment-14138255-20131117030344

@GotGame

Flawless logic except it is not all about last names. It also has to do with Genetics. Red hair is a resessive trait, so it would take a black haired man and a red haired woman to get the black/red hair. So Yang and Ruby may have come from different mothers and seeing as Ruby's is still around (as she has said "My parents" in ep. 1).