Sure, it plays a large role, but the main theme of the film seemed to be allowing yourself to love / be loved again after going through tragedy. (religion.blogs.cnn.com)
This goes along with the overall theme of the film which almost always involves water. (waytooindie.com)
The movie gets the experience of parenting and, in many ways, it is a major theme of the film... the good of it and the bad of it. (moviecitynews.com)