Being found abandoned in a Wales church during an rescure mission, Sarah has no recollection of her true family. She was welcomed into the Henning family and quickly became close sisters with Catherine. Despite having such a traumatic childhood, Sarah never had the desire to find out where she came from.
To her, the Henning family and Catherine specifically defined the woman she is today. While she does care for others and wishes war would end, she never had any sort of drive to enter the military. She only did so when Catherine made the decision. Even though it wasn't her calling, her impuslive nature ended up being a good fit with the life of a Frame pilot. Dry and sarcastic, Sarah has seen her family extend to the other pilots stationed on Mars. In the most unlikeliest of places, Sarah has found a true family.