“the court interferes, not on the ground that any wrongful act has in fact been committed by the donee, but on the ground of public policy, and to prevent the relations which exist between the parties and the influence arising therefrom being abused,”
“13. Whether a transaction was brought about by the exercise of undue influence is a question of fact. Here, as elsewhere, the general principle is that he who asserts a wrong has been committed must prove it. The burden of proving an allegation of undue influence rests upon the person who claims to have been wronged. This is the general rule. The evidence required to discharge the burden of proof depends on the nature of the alleged undue influence, the personality of the parties, their relationship, the extent to which the transaction cannot readily be accounted for by the ordinary motives of ordinary persons in that relationship, and all the circumstances of the case. 14. Proof that the complainant placed trust and confidence in the other party in relation to the management of the complainant’s financial affairs, coupled with a transaction which calls for explanation, will normally be sufficient, failing satisfactory evidence to the contrary, to discharge the burden of proof. On proof of these two matters the stage is set for the court to infer that, in the absence of a satisfactory explanation, the transaction can only have been procured by undue influence. In other words, proof of these two facts is prima facie evidence that the defendant abused the influence he acquired in the parties’ relationship. He preferred his own interests. He did not behave fairly to the other. So the evidential burden shifts to him. It is for him to produce evidence to counter the inference which otherwise should be drawn.”