At my engagement party, my future MIL snatched the old silver locket from my neck and threw it to the floor. “How cheap!” she sneered. “Our family only wears diamonds!” The guests nodded in agreement—until my fiancé’s grandmother slowly stood up. With trembling hands, she put on her gloves, picked up the locket, and whispered, “This is a one-of-a-kind piece Charles Lewis Tiffany crafted for Tsarina Maria Feodorovna. It’s priceless... Who are you?” My name is Anna, the "other" step-daughter. The