If my grandmother left 2 Wills and I believe the newer one is fake, how can I prove it?

Question Details:

The Iill I have is done by her attorney. It is very specific and leaves her daughter nothing. They hadn't spoken for years when she did this Will. Her daughter claims to have a newer Will done by her attorney, not my grandmothers, that leaves her everything. How do I prove she wouldn't have signed it if she knew what it was?

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