I can’t say this with 100% accuracy since I read the novel a while ago but what I believe what the father was referring to when he said he was going to kill Adi was that he was going to stage the male Adi’s death and then bring Adriana back as a relative to give birth to an heir with the asshole knight, and it doesn’t really matter what it looks like to outsiders because he knows anyway that Adriana is his true blood since he is so obsessed with the bloodline. But this is absolutely not what Adi wants so that’s why she told the other guy to crush his balls.

Another thing i dont get is
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If her father was cold and calculating enough to keep both children alive why would he want to kill her now?
He then would not have any remaining heirs?!??! Is he planning to grow a whole new one? Or adopt a nephew?