You know I almost felt so sorry for the movie that I gave it a higher rating. Not that it would deserve it. But because the average rating right now is so low. Don't get me wrong, the people involved may have some other "talents" (like being on Youtube), but either the movie is so Meta that it actually is fun and no one understands it - by singing what he's going to do wrong at the beginning you have to wonder about the grade of stupidity in one of the brothers.
Don't get it twisted though: The other brother is not really good either. While we all know that siblings have a love-hate relationship (or heard about that), this really blows the lid of. The things the brother does are almost as despicable as the things the sister does. Why on earth just sit there (literally in one case) and let them do that? Well even if you don't mind that and consider it "silliness", the cliché thing is really ticking all the boxes! I mean all of them. It's so on the nose that you'll find hitting your face just to get rid of it (unsucessfully I may add).
The "actors" look nice and I almost feel sorry for them. But it should be back to school for them before they take on another job. Same goes for the screenwriter (there was one, right? Not that you could tell ...)