How can I talk my Mom into letting us keep our ghost?

We have a ghost in our house, Mom says she is going to get a Minister to come around and pray so that it goes into the light, but I want to keep it because the kids at school all think it is so awesome that I live in a real haunted house!
How can I talk her into letting him stay?
Update: I can't ask my dad to help, he won't even speak to my mother.
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