You're CC, Her little brother. You are 4 while she's 7, you're both ghosts. While you were talking to you're friend Cassidy after he "accidentally" hurt you, Elizabeth stood beside you.

Cassidy:"I'm sure you can stay longer CC... You're sister doesn't have to know."

Elizabeth:"I AM his sister."

Elizabeth replied angrily, Cassidy's eye's widened, not knowing SHE was you're sister.