Mandatory "this is my throw away" and idk if he uses reddit.

Hey guys, so Im a little pissed at the moment.  I took an AP class last year, did pretty well.  This year, my brother is in the same class.  I just realized this today.  I saw some papers on the floor in his room, and I happened to see an essay title that was pretty unique and I said to myself "Wait, I think I had an essay with a super similar title!".  Sure enough, I went to my laptop to try to find the essay document, and I did.  He copied the entire essay word for word, and didnt change anything.  He didnt tell me he was doing this, nor asked for permissions.  Frankly, i dont even know how he got it.

Anyway, what should I do?  I know the teacher pretty well.  Should I say anything to my parents? And what should I say to him?  Should I even say anything to the teacher?  Pretty disgusted to be honest.  Or should I Just let it run its course and do nothing

 EDIT: I'm quite surprised at the controversy seen in this post.  Frankly, Im quite surprised at the people who think I should ignore it, and basically congratulate him for doing so.  Let me clear something up,  I am not "just mad because he didnt ask me for it first."  NEVER would I let him copy a long paper like that.  It would be different if it was like a hw assignment, or a reading for a class. But this was a big paper that I remember doing back then.  He has lost my respect for him as a person, and frankly doesnt deserve whatever grades he is currently getting in that class, because I busted my ass off to get what I do in school.  Anyway, I might sit him down with just him and me and talk to him.  I dont plan on telling my parents or the teacher.  I may update at some point.
user
Brother stole a paper from my AP class,
assistant
Mandatory "this is my throw away" and idk if he uses reddit.

Hey guys, so Im a little pissed at the moment.  I took an AP class last year, did pretty well.  This year, my brother is in the same class.  I just realized this today.  I saw some papers on the floor in his room, and I happened to see an essay title that was pretty unique and I said to myself "Wait, I think I had an essay with a super similar title!".  Sure enough, I went to my laptop to try to find the essay document, and I did.  He copied the entire essay word for word, and didnt change anything.  He didnt tell me he was doing this, nor asked for permissions.  Frankly, i dont even know how he got it.

Anyway, what should I do?  I know the teacher pretty well.  Should I say anything to my parents? And what should I say to him?  Should I even say anything to the teacher?  Pretty disgusted to be honest.  Or should I Just let it run its course and do nothing

 EDIT: I'm quite surprised at the controversy seen in this post.  Frankly, Im quite surprised at the people who think I should ignore it, and basically congratulate him for doing so.  Let me clear something up,  I am not "just mad because he didnt ask me for it first."  NEVER would I let him copy a long paper like that.  It would be different if it was like a hw assignment, or a reading for a class. But this was a big paper that I remember doing back then.  He has lost my respect for him as a person, and frankly doesnt deserve whatever grades he is currently getting in that class, because I busted my ass off to get what I do in school.  Anyway, I might sit him down with just him and me and talk to him.  I dont plan on telling my parents or the teacher.  I may update at some point.
user
Brother stole the title of a paper that
assistant