Lady Sybil Crawley
is the family rebel and is a very political woman who considers the lives and feelings of the underprivileged. She is removed from any family issues regarding money and inheritance. She doesn't care about her family's money and is unlikely to get much of it anyway.
Sybil Crawley is not married, and her family has not been pressuring her to find a husband given that she is the youngest of the three daughters. However, she has created a strong friendship with her father's chauffeur, Branson.