Why does it feel like fl is the step sister of the Knight

Correction, half-sister. "Step-" is usually used for people not biologically related, "half-" for, well, people who share a bio parent.

But yeah, the implications/foreshadowing has been there since the beginning, I wouldn't be surprised. I can't wait to see if/when it gets confirmed and Anna and Franz learn they're half-siblings - I think they'll both be horrified and slightly disgusted ╮(￣▽￣)╭

Thanks (⌒▽⌒)