|Portrayed by:||Patricia Clarkson|
|First appearance:||"In Place of Anger"|
|Last appearance:||"Everyone's Waiting"|
Sarah lives with her caretaker and friend Bettina in an artists' colony in Topanga Canyon. She left Ruth to deal with sick relatives and the two siblings fell out with each other when Sarah babysat Nate and caused him to lose his virginity to a friend of hers and David got lost in the woods. However, she gets along with Claire due to their shared love of art and gives her niece a birthday present of magic mushrooms to help release her creative side.
Ruth later learns that Sarah has developed a drug addiction to the painkiller Vicodin and after weeks of withdrawal, Sarah is admitted to rehab, which puts her life in perspective.
Following Nate's death, Sarah gives her sister invaluable support and Ruth moves into her house in Topanga Canyon.