One thing thats been buggingme about Kai'sa...
She called 
"sister". I know this could mean like a familiarity tone, but considering her character she wouldnt call someone that unless they truly were sisters.....
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She can't even remember her own father, but she could remind some kind of sister, if jinx was to be it?
I really doubt it. It's probably meant as a joke line. I didn't get to listen/watch whole vo as i was at work. But if she only vaguely remembers Her father, I doubt she remembers or is able to recognize a younger sister, as jinx still looks like a kid and Kai'sa seems to be an adult woman