How do you legally revoke a Will?

Question Details:

Ten years ago, my sister took my mother to a lawyer so she could draft a "Will", However, my sister died last week. She obviously made herself the executor. My mother, who is 83, thinks that she can rip up the original copy of the Will and that would be the end of it. Would most lawyers put something on record at probate so it would be known that a Will was drawn?

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