I'm fine with ALL my theories being retconned into insignificance. If the story is good, I like surprises. I'll still overthink the development the whole way, because we all see things differently and I love hearing how other people discover perspectives and details I've missed.
If we go by the redacted devlog, Ocean is not planning on a completely vanilla/beige sanitised game, but a stable development. What that means in practical terms can't really be second guessed. If one blood relative, why not all? Who is even a LI? Maybe Miru does cut off Willi's dick, and the NTR is Willi not bing able to do anything but sit in the cuck chair for the remaining game.
Is it though? What Ocean said in that devlog doesn't necessitate name changes. We're operating on the assumption of who is or isn't a LI, and who hasn't already been mentioned in SG. Ocean can still stealth update SG's script if he choses (I'd consider it poor form, but it's possible), or the story he's telling still has them with the same names even though not blood related. He did specifiy who wasn't related by blood, specifically. I think it's an acceptable belief if there are such things as blood relations, there are also people related but not by blood (related through marriage, adoption whatever). Even these things are up for grabs until he puts his cards on the table.
MY guess is it'll be obscure in Ch4 (unless the awkward Willi/Katie?helen hug is a moment when their pasts are explained), but there will be enough clarity to make far more reasonable assumptions than what we have now. If Ocean leaves us in limbo, well, it's going to suck to wait for CH5 to find out more I guess.
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Monica was at the store as well. After William punches Abigail for standing on Miru's head, Monica arrests him, but he gets away because Sedila proves Abigail was standing on Miru's head - which happened while Sedila and Willi catch up on the past. Which he also does with Monica when she arrives, despite having punched Abigail to ahego and back. What, this was actual writing of the golden age? If by golden, you mean we mean I pissed myself laughing I guess?

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Oh wait... who's this guy? I'd forgotten this happened.
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Edit: Also, what an excellent couple of pages discussion, sad I missed out