I also write, as it happens, and while I would never presume to be the equal of a professional like Gaider, this goes beyond mere continuity error. If the half-elf child is confirmed to be Alistair (and as far as I can see, this hasn't happened), then we have two versions of Alistair's parentage that directly conflict with each other. I think it's fair to say that somebody (maybe Gaider, maybe someone else) screwed up big time. I'm sorry, but as mistakes go, this is a doozy. The fact that nobody caught it prior to publication of the game or the book completely boggles my mind.
Professionals like Gaider make continuity errors all the time. Google YAABI. LKH sells thousands of copies beyond Gaider's dreams and her books are full of continuity errors, from the small to the large. It's up to the author, of course, but also their editor to try and avoid these/ferret them out and fix them. Sometimes they catch the errors, sometimes they don't. And sometimes, some later stage editor screws something up. I am published. This does happen all the time.
I'm only an amateur, I'll admit, and have never been published ever, but with a big project (particularly one as big as Dragon Age, which is an entire franchise unto itself), going back and making sure your plotline is consistent is lesson number one! Small mistakes are unavoidable, but I think we can safely say that this crosses the line into "major ****-up".
Not arguing how big a screw up it is. Just telling you flat out it happens all the time. And DA may be a big video game. The books aren't nearly as big, just look at their sales numbers. On Amazon, Asunder's(out this month)position is 12000 plus. It does better if you seriously narrow down the search to books that have movie tie ins. There it's ranked number 69. The other books are even farther behind. And notice the lack of 'bestseller' or 'bestselling' anywhere on the cover? I'm not saying they aren't good books. I liked them. What I am saying is that the Dragon Age books likely don't get the same kind of time/energy/scrutiny that say a Robert Ludlum(google some of his collasol mess ups) or Nora Roberts or Dan Brown(some more mess ups there). Plus, unless Gaider decides to give away the rough copies of the manuscript so you can see for certain that he didn't mess things up, which is crazy talk, then we really don't have any choice but to accept that there were some things that got messed up in the editing process and unless, and this is unlikely, the books end up soaring to the top of the bestseller list and hitting a fourth, fifth, sixth print run NO ONE is likely to see those inconsistencies addressed. That's just how the business works.
If it's not a mistake, and the version of events in The Calling is what actually happened, then this just raises questions that can never satisfactorily be answered. Why did everyone involved feel the need to construct such an elaborate lie? Why hide the truth even from Alistair himself, who certainly has a right to know? Who the **** is Goldanna really, then? And if she's not Alistair's actual sister, and in fact some sort of hired actress or something, then why didn't Eamon/Maric/whoever pay her enough to at least pretend like she was happy to see him? Who would be so incredibly cruel as to fool an individual (who they presumably care for, judging by past actions) into thinking that his only living family wants nothing to do with him? Eamon and Maric would have to be despicable sociopaths not to realise and/or care about the immense emotional damage this would do to someone as sensitive and insecure as Alistair shows himself to be on more than one occasion.
I can't actually answer any of those questions. Only Gaider can and depending on how many books he's contracted to do we may get those answers, um, never. An informed opinion might be that it isn't that elaborate a lie. After all, Fiona's gone back to Weisshaupt to lead the search for The Architect. She's out of the picture. Eamon and Maric are already close, so Maric gives Alistair to him to raise. It's also perfectly plausible that Goldanna's mother was pregnant/had given birth shortly before Alistair's arrival. There were complications, her child died, and so Maric's heir was supplanted in its place. Hell, maybe Maric did have sex with the maid in the first place. Alistair says his mother died when he was super young, maybe she didn't make it past his first year. So, with Alistair supplanted for the maid's dead baby, Goldanna would have no reason to question whether or not Alistair was who he was purported to be, Maric's bastard by her mother. And not telling Alistair, well, I'd think that would be obvious. There is zero benefit to Alistair, but a whole lot of potential detriment to everyone else, if he knew the truth. He hasn't shown any magical ability, so telling him his real mother abandoned him can only hurt him more.
Also, if Alistair had an elven mother, why didn't Loghain just say so at the Landsmeet? Alistair would find himself shut up in the alienage with his claim to the throne completely nullified, and Loghain would rule unopposed as regent.
I don't know that Loghain would have been privvy to this fact. I mean the book certainly doesn't say Maric gave Loghain a blow by blow of his relationship with Fiona, nor does it say Maric told Loghain that Fiona had a child by him.
As for the whole elven genetics thing: Saying "it's a fantasy land and it has different rules!" is silly at this point. Everything else about basic human anatomy we've seen in Dragon Age so far works exactly as it does in the real world. Humans are humans are humans. The "magic!" excuse can only take you so far before it just becomes a cheap and lazy way of excusing things you don't feel like explaining properly.
Not to set you off an a tear, but the truth is this could very well be the 'actual' explanation. The nice thing about being a story teller, of any kind, is that you can make up any reason you want for anything. As long as you can get your audience to suspend their disbelief(which apparently they weren't able to fully do for you, and that's a failure on their part, not yours) then they will believe whatever you, the storyteller, decide to make 'real' or 'reasons' or whatever.
Fiona is just one woman, her word can't be taken as gospel. Her saying that her child is 100% human doesn't mean that that is, in fact, the case. All it means is that he's completely human, in so far as anyone can tell, with the current level of technology that currently exists. Theories of genetics and hereditary are, so far, completely unknown in Thedas. Otherwise, a quick paternity test could easily be done to verify Alistair's parentage, which, apart from telling us who his mother is, would've solved a metric bottload of issues in Origins, going all the way back to Isolde being a **** to him when he was young because she thought he was Eamon's bastard.
You have a valid point, if this were the real world. It isn't. It's Gaider's world. The words used in the book are, I think, 'wholly human'. And yes, it's an inconsistency, especially considering the use of 'elf-blooded' human in Hawke's story. I think a lot of readers interpreted that to mean 'looking wholly human' not actually being purely human, but of course that's me bleeding my inference so I may have been in the minority. And like I said earlier, I think the only reason Fenryiel looked more 'elven' in Hawke's story was a DESIGN choice, i.e. the designers changed the look of a lot of the species of Thedas in the second game and Fenryiel got lumped in. Oops, their bad.