On my 18th birthday, I walked into a ballroom full of balloons, music, and cameras—only to hear my sister laugh, “Surprise! I’m turning eighteen again tonight.” My mother smiled and said, “Just let her have this, honey.”

but enough to make heat rush into my face. The photographer kept taking photos of Vanessa beneath my birthday banner while my parents stood beside her, glowing with pride. My name was not written on the cake. My favorite songs were not playing. Even my chair at the family table had been handed to one of Vanessa’s friends.

I walked up to my mother and continue reading …