Prior to Chloe's car accident, Aaron and William maintained general communication with each other. Following the accident, William and Aaron fall out of touch with each other. In the Alternate Timeline created by Max Caulfield, Max finds a letter addressed to William by his brother Aaron. In his letter, Aaron apologizes his brother for not staying in touch, but explains that his work was "piling up".
He told his brother that he was being sent to Salt Lake City, Utah to oversee the construction of a new parking lot. He apologized for not being able to send William a "bigger check" in light of the financial straits they were both experiencing. He ends his letter with the possibility of visiting the family next spring, with brief encouragement for his brother and asked that he give Joyce and Chloe a kiss in his stead.
- Aaron's first name is the middle name of Henry Aaron Prescott.
- Max mentions that she never heard much about Aaron in the original timeline.