You hire an attorney. That's the way to contest a will.
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You need to hire an attorney NOW.
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I agree with my colleagues. You have a complicated and messy situation. You are not going to be able to handle this without the assistance of a very skilled probate attorney.
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You need to hire a skilled probate attorney that practices in the county where the probate is being administered. I see you are from Gainesville. If that is where the probate is, Sam Boone is a great probate attorney. His website is http://boonelaw.com/. Best of luck to you.