Two Curses Two Sisters

Our mansion was surrounded by tall metal fences. Security cameras were installed inside and outside the large property. The gate and mansion were guarded by four ex-military men who were highly recommended by one of my father's friends. A few minutes after my parents were gone, our nanny took my sister and me outside the mansion to get fresh air and play in a specially designed sandbox. Our nanny saw the four guards coming her way and thought it was kind of unusual.
As soon as they were close enough one of them pointed his gun at her while another covered her mouth with tape, and restrained her arms and legs with rope. The other two men picked my sister and me from the sandbox. Our nanny was trying to free herself and one of the men hit her on the head with his gun. She was left unconscious and we were taken to an uncertain fate.