My sister sees ghosts

This all happened last week. I was babysitting my little sister while my mum was outside gardening. My sister was playing with her favorite toy, her Lego blocks as usual when she stopped for a second and stared. She looked like as if she was trying to listen to something. I was surprised because my little sister is 18 months and she hardly focuses on anything but her Lego blocks. So I watched her concentrate on what she was doing. Then she quickly got up and ran down the hallway. I followed her and stood at one end of the hallway. I hate the hallway because the doors always slam on me when I go past them even on boiling hot days. My sister continued running down the hallway till she got to the end then she stopped and stared. Then I hear a big “BOO!” and she runs to me screaming I pick her up quickly and ran into the lounge room away from the hallway. The “boo” sounded like a deep man’s voice. …