The biggest mistake estate planning attorneys see is the failure of families to properly allocate their assets when they have blended families. Sometimes this involves promises made to children, but never followed through on. Other times a parent leaves it up to their current spouse to provide for children from another marriage and that rarely happens. Another devastating outcome is when a spouse is forced to share limited resources with grown children because no Will was done. I can say it is really is not about the money, loved ones who are already grieving are confronted with shocking news that the deceased did not make any provision for them.