Susan
Susan asked Emma Donoghue:

This question contains spoilers… (view spoiler)

Emma Donoghue SPOILER ALERT. Hm, I haven't heard about Irish uncle-niece marriages and that's certainly not allowed by the Catholic church. For first cousins you had to seek permission. And neither of those cases is like brother-sister full sibling bonds, which I feel pretty confident was absolutely taboo.

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