First, I know I should have posted this yesterday, but LIFE. Second, I was wrong, in one of my more recent artworks, that isn't Blake's sibling, that is her mother, though I doubt she'd mind much. Also, I was right, and wrong, about Blake's family being involved with the White Fang, apparently her father was the leader of the White Fang. Going by the story thus far, that means he stepped down five-six years ago (the whole months since the fall of Beacon thing doesn't give a very specific timeline) and this Kong person took over. As we saw towards the end of the episode the two White Fang members are on Adam's side. It is possible that the White Fang as a whole is shifting towards Adam's way of thinking, possibly relating to Salem's influence or alignment. This would mean Blake's dad is only being spoon feed the whole, "We're still peaceful" bull until the point his influence as the former leader isn't sufficient enough to stop the recruitment of members towards this more aggressive philosophy. Also, one of the two White Fang members mention one sister Illya (I'm assuming that's how it is spelled), I envision her to be like a sister to Blake, possibly adding to the drama as Blake finds out she is of the more aggressive way of thinking.