Finding a one shot

Does anyone know that one shot that there’s this family, two brothers and the parents. The older boy I’m pretty sure, died bc their parents sacrificed him, ate him or smth and the brother thought like the older was at fault and disliked him but when he stated seeing the dead brother in the mirrors and when he turned some certain age his parents showed their true colours to him as well and the brother who felt like he was annoying him through the mirrors was actually trying to warn him the entire time. And then the younger runs away, the end.

If u do have the name please send!!!! (●￣(ｴ)￣●)