As my boyfriend walked down the aisle with my sister, I stood in the shadows of the waiting area.   My mother turned to me and said matter-of-factly, "Maisie, don't stand in the way. Once your sister finishes rehearsing, it'll be your turn."   "The bride... isn't she?" the officiant asked quietly.   My father waved a dismissive hand. "The sisters each get a rehearsal. That's only fair."   Fairness had always been their favorite word.   Whenever they bought me a dress, they made sure Serena Carter got a more expensive one.   Whenever they cut me a slice of cake, they cut two—and let Serena choose first.   And now, even at my own wedding, my groom had to walk down the aisle with Serena before he did with me.   Adrian Hayes never looked my way.   He lowered his head to adjust Serena's veil, his expression so tender it felt unfamiliar.   It was the same look he had worn when he proposed to me.   Only later did I realize that the so-called rehearsal had been their real wedding.