She has to leave Norland because her brother now owns her fathers estate since he died.
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Mrs. Dashwood is very angry at this lack of propriety that she almost storms out; but Elinor, her oldest daughter, persuades her to stay and keep good relations with her stepson.
Elinor is entirely sensible and prudent, able to handle people and situations very delicately; her sister, Marianne, is very emotional and never moderate, lacking some of the good sense that Elinor has. While Marianne and her mother are allowing themselves to drown in grief, Elinor is grieving too but also attending to matters at hand. Margaret, the youngest sister, is young and good-natured, and not as extreme in either sense or sensibility as the other two.