Well, given that it's a royal family, it's not surprising if you look at the nature of royal families and attempting to protect their lines. Mind you, their line is extremely long, but it seems as if they only had each other (to some extent) when they were younger, thus making it possible. However, the canon incest is quite common, or implications of it, in a lot of anime. But it's a fact even in "children's" books like Harry Potter.
I don't know why I just explained that, but it seemed like it confused you. xD
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I don't know why I just explained that, but it seemed like it confused you. xD