I'm trying to remeber this horror movie, I think it's european. It's about a young guy who moves in with his cousin's family. The cousins are a boy and a girl. The boy gets upset with his parents by making the guy move into the sister' room. Turns out by the end, there is no girl. She died very young and the boy halucinates her, that's why the boy is upset about the room. And the boy ends up killing his parents and is cousin by the end of the movie. I even remeber a scene: the boy points the guy to his dad who says "just make it quick"
There's even a theme song, a kinda catchy song that plays at the end.

Bump, you resparked a neuron in my brain and want to know too

>>211917227 (OP)
The House at the End of the Street (2012)

>>211917332
Nah. It was european.
But tank you for trying to help

That wasn’t a movie, that was a dream I had. I was the father.