Weird alien movie

So, I only remember parts of this movie that I watched about 8-9 years ago. I remember a family driving in a car (they could have been on a roadtrip– maybe not) but the two sons hated eachother and were Always fighting. They were sitting in the back/trunk area and the oldest brother punched the little brother (could be the other way around) and he fell out the back of the car. The parents were oblivious to this. Later in the movie there were aliend– don’t remember what that was about thou…

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