Suppose Adam and Barbara, residents of Chicago, have two children: Cathy and David. Adam and Barbara both pass, and in their joint will they leave 80% of their estate to Cathy and 20% of their estate to David. David is shocked by this and he is sure that Cathy played a part in this.He wishes to challenge the will because he suspects undue influence. However, there is a clause in their will that reads: “If any beneficiary under this will seeks to obtain, in any court, an adjudication that this will or any of its provisions …