Oh, don't say that! Even if you had a sibling whose interests were the exact opposite of yours, you could still be good to them. Anna and I liked some of the same things, but we also liked many different things as well, and we got along very well.
[... For the first five years of Anna's life, at least. But now they're getting along very well, so that's something!]
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[... For the first five years of Anna's life, at least. But now they're getting along very well, so that's something!]