Talk:Episodes/@comment-108.48.0.118-20171101214638/@comment-4010415-20171102033452

Ruby and Yang have the same father and different mothers. So, they are still blood-related, it's just that they're half sisters. Raven, the bandit who kidnapped Weiss, is Yang's mother. Summer, Ruby's mother, is the one who went on a mission and never came back.

I think you should rewatch the part in Burning the Candle where Yang explained the stuff about her mother to Blake.