Last week, almost exactly a year after his death, James Brown's children filed court documents formally challenging their father's will. They are alleging undue influence at the hands of his advisors who stand to make money from managing the trusts set up in the will.
Undue influence is a very difficult allegation to prove when it comes to invalidating a will. In Alberta, the courts will first presume in favor of the testator's intention. Those seeking to invalidate the will must then provide evidence of suspicious circumstances and undue influence. If the court finds that suspicious circumstances were present, it is up to those propounding the will to rebut those circumstances and show that they had no effect on the testator.
The reason why these allegations can be so difficult to prove is because the primary witness is deceased. As a result, any evidence usually comes from third parties (i.e. friends, doctors, etc.) who can provide their interpretation of the testator's state of mind at the time the will was executed. It is sometimes easier to prove undue influence when mental capacity is also an issue; however, if it is not, then the courts are traditionally very respectful of a testator's intention and will not disrupt it unless there is clear, substantiated evidence of undue influence.