fadingtales:

Caroline: Have you been here all night?
Stiles: Well, mom and dad had to work. You know, the usual. I wanted to make sure you didn’t wake up alone.
Caroline: You stayed here all night for me?
Stiles: You’re my sister. An annoying sister, but my sister nonetheless. What if somebody tried to slip cyanide into your IV or something.
Caroline: [laughs] And you’re a dorky brother, but… thanks.

— TW/TVD Crossover, Stiles and Caroline are stepsiblings