Do we have ghosts?

My best friend and I believe I have ghosts in my backyard(girl and boy) holding hands. They seem to be skipping around my retention pond and running on a wood platform. They often make noises like footsteps. The little girl suddenly falls in with the boy coming behind to save her, then the girl gets out of the water with a horrible looking face. But we do not see the boy anywhere. Then it happens all over again what do we do?

Ask_Sean Says, If thats what you belive then yes there are ghosts (if you belive in ghosts then yeh to you they are real) but in my opinion I dont belive in ghosts. (did I spell belive right? BE-LEAVE)