A transaction may be recsinded if "the court is satisfied that the gift was the result of influence expressly used by the donee for the purpose" "no one shall be allowed to retain benefit arising from his own fraud or wrongful act"
The court intervenes in cases of presumed undue influence "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 existed between the parties and the influence arising therefrom being abused"