I fear I have not expressed myself well enough, of course the story revolves around Nika he is the MC, my point was that Nika do not need to be related to the Zanes in any way. He does not need secret parents or a mysterious past, those elements, I think, would be better employed on Nami - at the same time that frees Ocean of some headache. We may be lead to believe that Nika is "special", the lost son of the Zanes or the antagonist or some other family, and in fact the only thing special about him is his circunstancies. Nami so far at least has a real connection with the Zanes, she has Leia's earrings, Nika has nothing.
Sasha, yeah, she shows disinterest because she is interested. Maybe she does not know how to process the feeling of actually being attracted to someone, and looking at her experience with males, she may want to be certain that Nika is not a scumbag that will fuck her and piss off. It is just speculation with out much to back it up ? Sure, it is, but so is the idea that Sasha is some long lost friend or a spy of the Revera looking out after Nika. I always tend to think that the more simpler the answer is, higher the likelihood of it being true, and a over protected rich girl being zealous over who she befriends and dates is a more plausible scenario than the alternatives.