When Person A makes a will misrepresentation of material fact to Person B in order to cause Person B to act to his injury, this is fraud.
But what is it called when Person A makes a will misrepresentation of material fact to Person B in order to cause Person B to act to the injury of Person C?
Lawsuit / Dispute Attorney
Slander is an untruthful spoken statement about a person that harms the person's reputation or standing in the community. Contact a local lawyer - many may give you a free consultation for an hour - to discuss your specifics. Far too many variables exist in the short post you wrote for any further observation by me.
Good luck to you.
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