Steve had a younger stepsister y/n. But when she was 5 she got hit by a truck. She died for a second then came back to live on her own. Y/n’s stepparents were scared of her so they didn’t let her inside anymore. They told Steve his stepsister had ran away. The reason why y/n came back to live was because she’s actually a Creel. Vecna is her dad but no one knows this. Y/n also doesn’t. They find out about that later in the story.