I think if you look at the themes that are presented in the film, some are inherently social, and I think that any film which deals with the family is dealing with the smallest social unit in our society - and in a sense it is a question of scope.
Every time that I write a novel I am convinced for at least two years that it is the last one, because a novel is like a child. It takes two years after its birth. You have to take care of it. It starts walking, and then speaking.