A false belief held by a testator that is explicable by reference to the surrounding circumstances is a mistaken view, not a delusion vitiating testamentary capacity. Even if a false belief amounts to a delusion, it must be shown to have had a direct bearing on the testamentary dispositions; where the will makes substantial provision for the allegedly disfavoured beneficiary and contains rational explanations for unequal distribution, the delusion is unlikely to be found operative.
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