She was the daughter of the head family who through her own bumbling way tried to expose the actions of the previous head that was going against all their laws (as I recall, she pretended to try and lure away and rape the MC at a feast held at their estate?); she, like the fat brother, was adopted into another clan afterwards, because it was determined that she hadn't done anything wrong, or that her wrongdoing wasn't sufficient to exile her, at least.I am a sucker for such character development but unfortunately due to the glacial pace of this manga I have completely forgotten who she is.