Producers also introduced Zak's sister, Hayley Ramsey (Kelly-Marie Stewart), a disabled character who has the illness, Guillain–Barré syndrome. The topical story allowed writers to explore the impact that new disabilities have on family members.
In addition, producers brought in Zak's sibling, Hayley Ramsey (Kelly-Marie Stewart), a character with Guillain–Barré syndrome. This narrative allowed writers to investigate how new disabilities affect family dynamics.