Billy Harris is an unseen character, he has never appeared on screen.
Billy is the son of Mo and Jimmy Harris. He is the brother of Jean Harris and the half-brother of Viv Slater. Not much is known about him. He is the uncle of Lynne, Kat, Belinda and Little Mo. He is the half-brother-in-law of Charlie Slater. It is unknown if he is dead or alive. He is the great-uncle of Zoe Slater and Tommy Moon.