I'm not talking about Nika and Nami's relationship, but it's delusional to think Noji is actually their biological mum, when that is explained quite logically and repeatedly, without mentioning the word landlady. I can't remember which version where it's clearly stated Noji adopted them.
It's still clearly mentioned that Nika remembers his (actual biological mum) reading to him when you're walking with either Mila or Vic on the movie night, he's reminiscing about someone other than Noji... Nika also clearly mentions both his and Nami's parent's dying in a car crash. One version also mentioned Noji adopting them, along with the whole Zara - "I expected asians" comment - which shows that they look nothing like Noji to someone whose seen Noji around Nick a bit. Also the different surnames are making it even more clear.
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People just ignore all of that because they want Noji to be something more, and they're projecting their preferred fetish. It's pretty delusional to try to force Noji to be their biological mum rather and forcibly ignoring all the comments in the current published stroy being true. Current rework having even different surnames isn't a problem for a guardian/foster parent. A foster parent recieved govt money to pay for their wards, so the payment question is a non starter.
It might not be clearly defined, because Noji might not be 100% legal guardian, and they situation where she illegally took custody might be explained when their parentage is revealed - something to do with Scarlet's help perhaps? People have taken custody of children they have no legal rights to more than once in the history of this planet. Jenna's comment "Maybe Noji did the right thing" has some context here possibly.
Nika and Nami it's harder to define why they have hangups about a relationship if they're both fostered/adopted. The implication is that that relationship is specifically undefined on purpose, and left ambigious on purpose, but the tension only makes sense if they're not room mates. And they aren't even room mates (despite what Nami says to Jeff) because they have separate rooms
I'm not suggesting that Ocean isn't hiding things - but it's most likely he's hiding things about Nika and Nami, not about Noji. At least not about Noji being anything other than their guardian.
No look at me go trying to locate that darn teapot for my next quixotic quest...