sean is first mentioned by trevor's wife little mo morgan (kacey ainsworth), who urges trevor to be a part of sean's life despite his abusing both her and donna in the past. donna then flees to the slaters' house to hide from trevor who is on a violent rampage but is eventually found and leaves sean with mo harris (laila morse). trevor bursts into the house and the police are called. a violent trevor demands to see his son but kat slater (jessie wallace) fights off trevor, letting him beat her to prevent him going out the back where sean is being kept and to stall for the police's arrival. the police arrive and arrest trevor and donna takes sean home. in november 2002, sean is kidnapped from donna's house by trevor. trevor starts abusing little mo but she stands up to him and says she's not frightened of him. he threatens to start a fire but little mo shows little interest and goes to get sean and leave but trevor grabs mo, causing her to drop the lit match, and starts a house fire at little mo's home. local fireman tom banks (colm ó maonlaí) saves sean and little mo, but dies when going back to save trevor, who also dies. donna and sean leave shortly afterwards.