Board Thread:General Discussion/@comment-98.218.70.24-20150317164438/@comment-70.72.38.180-20150413022415

I'm going to go with the "Ruby knows because dad gave her 'the talk' " idea (but doesn't tell her the identity of Yang's mother because it's not only painful for him but not really important to Ruby because she lost her mom.). And just because they refer to themselves as sisters it doesn't mean that Ruby is oblvious to the situation. It would be wierd if Yang or Ruby went "this is my half sister so an so.". In short, they are close enough to see themselves and 'fully related' sisters and don't care if they're half related.