Ilya's brother question

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I have not read everything on Rachaels Reids website and probably missed an interview here or there.

But if anyone here has gone through the website

does she explain why Alexi hates Ilya?

I read the books from the library so can't look or reread but I think I would remember if it was in there

Actually Im asking because of his pink tunnel comment in the show "he hates me, I know, but it kills me" and assuming that it is also in the book.

not interested in peoples own speculation or interpretations, sorry