Where a doubt as to testamentary capacity has been raised, the propounder of the will cannot rely on the simplicity or rationality of the will's dispositions to discharge the evidentiary onus of proving capacity, particularly where the will itself contains the error that raised the doubt. Lay evidence that the testator appeared alert and capable in ordinary conversation is insufficient to establish capacity where such witnesses did not discuss financial matters, the testator's estate, or the claims of potential beneficiaries. Both elements of the Banks v Goodfellow test — understanding the extent of the estate and appreciating the claims upon it — must be positively established by the propounder.
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