Can a 30-day survivorship clause be challenged if it lets property go outside of the family?

Sometimes a person who leaves behind a valid will has talked about his or her wishes to family members. Unfortunately, that conversation can lead to problems, especially if you talk about your estate in a way that seems contradictory to  your will. This happens more than people might think, and even those who think they are communicating clearly can be misinterpreted.

A reader recently raised