I see. I still think it's unlikely for people as powerful as they are and as morally... liberal, shall we say, as they are, to care that someone is their biological sister/half sister and do them any favours because of that - look at how nobles in history would often wage civil wars and/or murder even their blood siblings that they grew up with for the throne, so why would someone like, say, Juliette Karlsson, be more compassionate towards an absolute stranger to her that grew up as a pauper, even if Olivia is her biological sister?
It's still a great game and maybe Tess has her reasons why she made all the Karlsson sisters treat Olivia nicely, but all I'm saying is it looks a bit like a plothole. (as it would've been more advantageous to them to start Olivia as one of the lower Ks,
and it would've also been a greater test of her mettle/wits if she had to rise through the ranks the way Kane has to...) Elena would've probably tried to stop them from making Olivia a K4 or a K3, but I'm not sure she would've had the power to do that if the Karlsson members of the board wanted to...