Do you believe in their existance

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Yesterday night i watched the episode where Khloe Kardashian had an experience with her father's ghost and psychic come over to communicate with him and tell them what he wanted. It got me curious and i went reading on net about the same. I don't really know what to think right now. I have a sister of mine who always sees my mum sometimes and we both got so curious and would wish to know more. Do you think these things are real?