Halloween II

After being attacked by Michael Myers (Dick Warlock), who vanished after being shot six times and falling from a second story balcony on October 31, 1978, Laurie Strode (Jamie Lee Curtis) is rushed to Haddonfield Memorial Hospital that same night while Dr. Sam Loomis (Donald Pleasence) continues to search for Michael. Seeking shelter to recover from his injuries, Michael steals a kitchen knife from an elderly couple's house and kills their teenage neighbor. He learns that Laurie is at the local hospital after listening to a radio broadcast and heads there. Paramedic Jimmy Lloyd (Lance Guest) starts to develop romantic feelings for Laurie, despite the chagrin of head nurse Virginia Alves (Gloria Gifford) and explains to her about Michael; he soon realizes Laurie is in a comatose state. When Loomis sees Ben Tramer (who is wearing a mask similar to Michael's) walking towards him, he mistakes him for Michael and attempts to shoot him, but Sheriff Leigh Brackett (Charles Cyphers) tries to stop him when an oncoming police car hits a van and explodes, accidentally killing Ben.
Once Michael arrives at the Haddonfield Memorial Hospital, he cuts the phone lines, and after killing most of the hospital personnel using various tools and methods, he reaches Laurie's room, but finds it empty. When Jimmy goes to get help, he discovers Mrs. Alves's corpse in the surgery room. While trying to run out of the room, he slips in a pool of blood on the floor and loses consciousness.
Meanwhile, Dr. Loomis follows clues Michael left at a school he broke into when his colleague Marion Chambers (Nancy Stephens) and a marshal (John Zenda) arrive with orders to transport Loomis back to Smith Grove's Sanitarium. During the drive, Marion tells him that Laurie Strode is Michael's sister. Now knowing Laurie is in danger and that he must get to her before Michael does, Loomis shoots at the window, demanding the Marshal quickly bring him to the hospital where she is.
Just when Nurse Jill Franco (Tawny Moyer) locates Laurie in the hallway, she is killed by Michael, who suddenly appears behind her and stabs her with a scalpel and then pursues Laurie through the hospital. She escapes to the parking lot after climbing through a window and then using an elevator and finds that none of the cars will start and all the tires are flat. Jimmy makes it out of the hospital and gets to his car to seek help, but he falls unconscious on the steering wheel horn, leading Michael to them. Dr. Loomis, Marion, and the Marshal arrive just in time to save Laurie. Marion attempts to contact the police from the car. Michael kills the Marshal and chases Loomis and Laurie into a surgery room. Michael stabs Loomis in the stomach, wounding him, before Laurie shoots him in the eyes with a gun Loomis gave her; blinded, he starts swinging the scalpel. Loomis and Laurie then fill the room with ether and oxygen gas as a distraction. Loomis orders Laurie to run for it before igniting the gas and blowing up the surgery room with him and Michael inside, evidently immolating them both in the fire. Michael stumbles out of the room, engulfed in flames before he collapses and finally dies.
The next morning, a visibly shaken Laurie has flashbacks of Michael's burning body as she is loaded into an ambulance and driven off to safety.

Question: Who is Michael's sister?
Answer: Laurie Strode; Laurie Strode