“It is essential to the exercise of such a power that a testator shall understand the nature of the act and its effects; shall understand the extent of the property of which he is disposing; shall be able to comprehend and appreciate the claims to which he ought to give effect; and, with a view to the latter object, that no disorder of the mind shall poison his affections, pervert his sense of right, or prevent the exercise of his natural faculties – that no insane delusion shall influence his will in disposing of his property and bring about a disposal of it which, if the mind had been sound, would not have been made.”
“(a) The burden is on the propounder of the will to establish capacity. . . . . . (c) Where a will is duly executed and appears rational on its face, then the court will presume capacity. (d) An evidential burden then lies on the objector to raise a real doubt about capacity. (e) Once a real doubt arises there is a positive burden on the propounder to establish capacity. . . ” . . . . . (c) Where a will is duly executed and appears rational on its face, then the court will presume capacity. (d) An evidential burden then lies on the objector to raise a real doubt about capacity. (e) Once a real doubt arises there is a positive burden on the propounder to establish capacity. . . ”
“Probate proceedings peculiarly pose problems for the court because the protagonist, the testator, is dead and those who wish to challenge the will are often not able to give evidence of the circumstances of the will. The doctrine of “the righteousness of the transaction” whereby the law places a burden on the propounder of the will, in circumstances where the suspicion of the court is aroused, to prove affirmatively that the deceased knew and approved of the will which he was executed, is a salutary one which enables the court in an appropriate case properly to hold that the burden has not been discharged. 33 But “the righteousness of the transaction” is perhaps an unfortunate term, suggestive as it is that some moral judgment by the court is required. What is involved is simply the satisfaction of the test of knowledge and approval, but the court insists that, given that suspicion, it must be the more clearly shown that the deceased knew and approved the contents of the will so that the suspicion is dispelled. Suspicion may be aroused in varying degrees, depending on the circumstances, and what is needed to dispel the suspicion will vary accordingly. In the ordinary probate case knowledge and approval are established by the propounder of the will proving the testamentary capacity of the deceased and the due execution of the will, from which the court will infer that knowledge and approval. But in a case where the circumstances are such as to arouse the suspicion of the court the propounder must prove affirmatively that knowledge and approval so as to satisfy the court that the will presents the wishes of the deceased. All the relevant circumstances will be scrutinised by the court which will be “vigilant and jealous” in examining the evidence in support of the will: Barry v Butlin (1838) 2 Moo PC 480, 483 per Parke B.”
“A finding of capacity to understand is, of course, a prerequisite to a finding of knowledge and approval. A testator cannot be said to know and approve the contents of his will unless he is able to, and does, understand what he is doing and its effect. . . . . . Further, it may well be that where there is evidence of a failing mind – and a fortiori, where the evidence of a failing mind is coupled with the fact that the beneficiary has been concerned in the instructions for the will – the court will require more than proof that the testator know the contents of the document which he signed. If the court is to be satisfied that the testator did know and approve the contents of his will – that is to say, that he did understand what he was doing and its effect – it may require evidence that the effect of the document was explained, that the testator did know the extent of his property and that he did comprehend and appreciate the claims on his bounty to which he ought to give effect. But that is not because the court has doubts as to the testator’s capacity to make a will. It is because the court accepts that the testator was able to understand what he was doing and its effect at the time when he signed the document, but needs to be satisfied that he did, in fact, know and approve the contents – in the wider sense to which I have referred.”
“In all cases the court must be vigilant and jealous. The degree of suspicion will vary with the circumstances of the case. It may be slight and easily dispelled. It may, on the other hand, be so great that it can hardly be removed. In the present case, the circumstances were such as to impose on the respondent as heavy a burden as can well be imagined.”