How does Juliet's relationship with her parents change in "Romeo and Juliet"?
Juliet begins the play as obedient to her parents. After saying that she "dreams not of" the honor of marriage, she promises to consider it, but to be controlled by her parent's consent. She is a dutiful young lady.
However, when she meets Romeo, things change. She alerts Romeo to the danger of him being in the garden, but then encourages him (by her actions) to stay. Her sense of duty is wanning. By agreeing to marry him, she is not only going against what she knows her parents' wishes to be, but she is abandoning consideration. She has transformed from a dutiful child to an independent woman.
This change is demonstrated in Act IV, as she argues with her father about marrying Paris. For the first time, she stands up for her beliefs. This changes the dynamic. Capulet stops being gentle, and becomes demanding. He asserts himself as a disciplinarian. Previously, he was concerned with Juliet's feelings and desires. Now, he is insisting upon his own. This decision forces her into desperate action and removes her more and more from the role of daughter and into the role of wife.