Hi! I’m BrogioAmbrogio, an English teacher and the editor of this game. I’m from America, Ohio to be specific, and we do in fact use “Big Brother”. A young girl saying “Bro” wasn’t all that common when I was growing up (I’m 22) and it still is uncommon, please remember Mallory is quite young. I appreciate your feedback. Also, I'm sorry I didn't reply sooner, I've been a bit busy with work.