

Does it ever get explored in any of the materials? Does he ever find out? It
seems like she knows about him.


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question
fate-stay-night
Does Shirou ever learn about Illyasviel being Kiritsugu's daughter?


In the Heaven's Feel route, yes, as she says she is in the True End:

> After Shirou kills Kotomine and is about to sacrifice himself to stop the
> Greater Grail, Ilya appears wearing the Dress of Heaven planning to shut it
> down herself. Here she tells Shirou that it's her duty as his older sister
> to protect him.

In the Unlimited Blade Works route, however, she doesn't

> as when Shirou and Rin go to recruit her to help fight Caster, Gilgamesh has
> already arrived before them, defeated Berserker, and ripped out Ilya's
> heart, killing her.

I am unsure about the Fate Route; to my recollection, Shirou doesn't find out
(am currently replaying) and I have yet to play Fate/Hollow Ataraxia. However,
because it also has hints of all the Fate/Stay Night routes in it, I would
assume the knowledge of Ilya and Shirou being adopted siblings is assumed.

> Of course, Ilya won't admit this to Shirou anyway in Fate/Hollow Ataraxia as
> the Shirou in it is not actually Shirou but Avenger assuming Shirou's form
> and Ilya seems to be aware of the False Grail War.


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