Sarah was the daughter of Ellie.
- According to the movie novelization of Dawn, Sarah was only 4 years old when she died, though it is unclear as to how she contracted the virus.
- According to Ellie's memory of her during the Dawn novelization, Sarah had two favorite books, Fox in Socks and Goodnight moon.
- There appears to be an error in terms of her age during the novel. Ellie remembers that Sarah would have been 12 years old if she were still alive and that she was 4 when she died. It may have been an error on the author's part or Sarah could have survived the first couple of years of the Simian Flu outbreak before she contracted the Simian Flu.
- It is currently unknown as to who Sarah's father was. He is assumed he died during the Simian Flu. It is also unknown if Ellie was in a relationship or married to Sarah's father before Sarah's death. After her death, Sarah became the posthumous step-daughter of Malcolm, and the step-sister of Alexander.