Three teens live together since their mother has died while each develops a personality.
I lived in a very similar situation myself and I was amazed by the memories the film gave me. Great acting, a simple but beautiful story and enjoyable imagery. I didn't see all the competition films but this was definitively not a bad choice to win.
Interesting was how the characters relations to each other were layered and every new interaction brought a new facet to life of the ambivalent feelings they were going through. The ending is an interesting choice of moving the oldest sister in a new direction, and it manages to make the viewer rethink his relations to the figures.