I think this movie is more about the relationship between the two sisters than anything else. If you are looking for a movie about the "end of the world" survival, you might be disappointed. I thought the acting was great. I have a little sister that I feel very close to and this felt real to me. The small squabbles that always amount to nothing when compared to the love that sisters have for one another. No one knows what I've lived through in my life better than my sister. She understands things that no one else can. Anyway, I'll recommend this movie to her.