I have highlighted three scenes that I feel best capture the relationship of the two and the growth it undergoes.
The Tease
Elinor: I do not attempt to deny that I think very highly of him. I greatly esteem him. I like him
Marianne: Esteem him? Like him? Use those insipid words again and I shall leave the room this instant.
Elinor: Very well. Forgive me. Believe my feelings to be stronger than I declared, but further than that you must not believe.
After the death of their father, the Dashwood sisters are left virtually penniless as all his money and estate, by law, belong to his son of a previous marriage. Their half-brother and shrewish sister-in-law Fanny (Harriet Walter) have come to their soon-to-be-home, displacing the life the girls of the only life they have known. Elinor's repressed emotions are also put in an uproar as she begins to form an attachment to Fanny's visiting brother Edward (Hugh Grant).
Up until this point, Marianne, who very much wears her heart on her sleeve, has been sulking about the home (all melancholy, downward looks and dreary piano songs). This is the first real, intimate interaction the sisters share with each other in the film. Marianne has gone to Elinor's room to inquire about her sister's affections.
Marianne believes that real love is the kind that is hot to the touch and burns you with emotion. Elinor, careful with her emotions, is not outwardly showing her devotion the way Marianne prefers. Marianne gently teases her sister in this scene–berating Edward's lack of passion for reading poetry and for the limpid response Elinor gives when asked if she loves him.
The scene quickly illustrates how each feels about the other. Despite all Marianne's teasing, she is devoted to her sister, even saying that she can't imagine living without her when she marries. Thompson and Winslet have a naturalness with each other and a playfulness that feeds off each other. Ang had them live together during the production so they could deepen their relationship off-screen, thus making the bond that much more believable onscreen.
Heartbreak and Understanding after the jump