If you are going to dispute a Will, or defend an allegation of a Will being invalid, you need information about the circumstances around the preparation of the Will, or Wills, in question so that you can decide the basis for your challenge or defence of the Will.
As a contentious trust and probate practitioner, I have come to understand how emotive the whole issue of inheritance is. Should your parents leave their worldly wealth to you? What provision should you make for your second time spouse in preference to the children of your first marriage? Should you treat your children equally? Should you prefer charities or close friends over family?