First of all, forget Spaced Out's character relations. After all, this game is gone from Patreon for this very reason, so I had to change it up a bit for Water World.
With that in mind, here is an explanation about the relationship of the characters in the game the way I'm making it and the way you can download it from Patreon. I'm not going to discuss any mods you might have installed along with the game. If they are not downloaded from my account in Patreon, they are to be considered 'unsupported' by me.
The young Amelia is the daughter of Lana and the son of the older Amelia (not the MC). This makes both Rebecca and the other Amelia her grandmothers. The MC and Lana were colleagues and working for the older Amelia, he is not related to neither of the Amelias, Rebecca, Lana or whomever you meet in the game. Consider him an orphan with no brothers, sisters, cousins, grandparents, aunts, uncles, dogs, cats or hamsters... he might have had a hamster when he was a kid, but it got out of it's cage and the cat ate it... and that's the neighbor's cat, not his. He didn't have a cat.
Now, where was I... Oh yeah - he had a relationship with his boss on the station (the older Amelia) and obviously likes the young one too. Initially he was hesitant to do anything about it, because he was worried that he might be in the past (the older Amelia mentioned being on a boat trip with her fellow students when she was young) and he could somehow mess up the future. Once he learned that this is not the case, he didn't have any issues having sex with her.
The young Amelia gives (in your own words) 'a fleeting fuck' about Lana because she's her mother. Knowing what Megan wants to do (re-build the machine and fuck up all of you), rescuing Lana is the only way you can stop her from doing that. Rebecca knows this, Amelia knows this, so regardless of what happened on the station, and even if we forget about their relationship with her (again Rebecca is her mother and Amelia is... for the lack of a better term, her mother-in-law) or the fact that Lana spent the last 20 years preparing for the moment you three arrive in this universe, they know that it's in their interest to rescue her. And I'm not saying that you should forget those facts, I'm saying that even if you do, it's understandable that they give 'a fleeting fuck'. And the MC should too.
I see what you mean now. Thing is I never used any mods for SU or WW, so the relationships in both games should go by default. I guess you mean that the young Amelias parents are Lana, and a character that is the son of older Amelia, someone who wasn't really mentioned so far. This clears it up, but still in my opinion, you should now make a few adjustments to both to the "story so far", and to the ongoing story sections.
In the story so far, it was never mentioned that older Amelia had some son, only that the MC and Jack were on the station. In Lanas video message, she mentioned a guy that helped her escape the station, but the story so far content doesn't really support that, neither the fact that she left out the alternative universe part, so whoever plays the game can understand that part, as that WW Lana got pregnant by some guy on the station that helped her, not that in the dude existed in the original universe. Later on, I don't remember older Amelia or Rebecca mentioning a son from older Amelias part either, we just got the bomb dropped that younger Amelias mother is original Lana, not the WW one. This I think creates confusion as far as the relationships goes, and could be solved with a few dialogues regarding to the matter in-game and in the "story so far" section as well.
I understood why Rebecca or younger Amelia would want to save Lana as she is family, and that stopping Megan is imperative for the whole group (although I don't think we got a timeframe as to when Megan arrived into the WW universe and how exactly Lana prepared for the others arrival and when was she captured, I guess that's a story for later parts of the game), but beside that, on a personal level for the MC it still feels as a bit of a stretch. Like I get that he was reluctant to get into a relationship with young Amelia, as he thought it was his former boss at the beginning, but logically that seems weird, because he acknowledged early on that he is in an alternate universe, even in a future. That negates the possibility of fucking up the timeline, which was his reasoning at the beginning. You arrive to an alternative world, to a future where the planet became oceanic instead of terra, if it has any relation to your original world, you can scramble the idea of the timeline not being fucked, for reasons outside of you anyway.
As for the Lana thing, it just feels like he rolls along with the events rather than having his own opinion on the matter, and that was okay for the cruiser, because he was in a situation where he was dependent on them, or with Evelyn now that we know about the implant, but still really doesn't explain his "okay-okay right" attitude in the current situation. Stopping Megan is important, but Lana fucked him over, essentially revived Susan and brought her to this universe, who for the matter is an obvious threat as well, yet raises no concern with the situation. And that would go fine along the line if he forgave at the end of the Antares events, but we don't know that. I don't know if you'd be open to the idea of implementing a choice for the "story so far" part of the game, to decide if the MC forgave Lana, or dismissed her, and branching some of the dialogues into two parts when they talk about her? I think it would improve the overall coherency a lot.
As for the "preparing for 20 years" thing, I'm not sure it should matter for him, as he's only recently arrived, and it's only by pure coincidence that he arrived on the same cruiser where young Amelia was, and it's not like he was any better with what Lana done so far, as he had to tend for himself and was completely dependent on the crew. When he is brought over to the other ship, older Amelia and Rebecca also seemed pretty dismissive about him, or not caring about him at all, at least the that's what I got from the dialogues, and he just yes-mans even that situation.
I don't mean these concerns I have with the game as an offense and I hope you don't take it as one, but as a feedback. These things I mentioned comes off as weird from a writing point of view, and with a VN it's basically the most important thing in it. Other than these things, I enjoy it overall, at most times it's pretty fucking funny.
Ps.: It was the first time that the actual dev of a game replied to me, so thank you for that!
