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I'd go with the third (and I've also been reading the plot guide on Gamefaqs.com). Really, the only relation between Yorda and Mono is that they both have pretty much the same place in the plot.
` But I'm very sure that Wanda is the first of the kids with horns, and one of Ico's greatgreatgreatgreatgreatgreatgreatect. grandparents of Ico.

` Then, in that plot interpretation/analysis FAQ, they said that the queen was taking the Dormin's power by having the kids with horns sacrificed, since they had a bit of it in them after Wanda's work with the Dormin. That partly being explained by the same kind of ghostlyness that the spirits in the castle (and teh queen herself) resemble the spirits in the Shrine of Worship (and the Dormin as they take over Wanda).

` Oh, and I just call the wanderer guy Wanda because I like the sound of Wanda, and though it's a girl's name, Wanda does look rather femenine.

Huzzah and well done Hegel...thank you for saving me the trouble of having to type all that out. sweatdrop Very glad to see someone else has taken that faq as seriously as I did.

Also, remember Cetra that SoTC has been officially announced as Ico's prequel, thus Wander absolutely has to be Ico's great, great etc. It's the only damnable thing Ueda will say about the whole series, so let's keep that in mind!

Any other questions? I pride myself on there being next to no loopholes in my knowledge on these games...o.o

The two theories that I like most are that

a) SotC is actually a myth created within the world of ICO to justify the sacrifice of horned boys, and

b) The Wanderer is not Ico, or even Ico's father (the wanderer is a redhead, and Ico seems vaguely hispanic), but is in fact the first in a long line of horned men.

The next time you play ICO, take a look at the statue you encounter at the first save couch. It looks exactly like a grown-up wanderer. Which leads me to believe that after the wanderer grew up (from being a horned baby) he figured out a way to escape from the ends of the earth, and went back to the land of ICO (albeit probably centuries before the birth of Ico). I'd like to think that the story of the wanderer's return would make an excellent cap to the ICO/SotC storyline.

Wrong.

Reason A:
The Wanderer is caucasian and a redhead, whereas Ico looks vaguely Peruvian and has dark hair.

Reason B:
The game ICO makes it very clear that Ico is the last of hundreds of horned boys to be sacrificed.

Reason C:
As can be seen in the tomb towards the end of the game, there is a horned shadow-person for each sarcophagus, therefore a coresponding horned boy.