Halloween II (1981) picks up where by the events of Halloween still left off. Michael (Dick Warlock) follows Laurie for the nearby healthcare facility, killing Absolutely everyone who arrives among them. The Tale reveals that Laurie is in fact Michael's sister: she was offered up for adoption as an infant. https://youtube.com/shorts/XxJicTFshOk?si=MWe_21sO5t57InfB