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The best way would be to get letters/statements from the other members of the family supporting what you say then threaten to apply to court for a variation of the Will unless he agrees one.
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I would consider whether there are others , family friends , neighbours etc who might assist with providing a statement. If you can put together a number of statements you will increase your prospects of succeeding. The courts generally try to avoid interfering with a testators wishes but will do so where they believe undue influence has occurred.
An application would be expensive if he contests the claim . It is hard to precise but it would be in the region of £5,000.00 but , if you succeed , the costs can come out of the estate itself.