A question that often comes up in estate planning is how in-laws should be treated, especially daughters-in-law and sons-in-law. This should be addressed in each individual situation as there’s not an easy answer to the in-law question in estate planning. Some things to consider are whether this is the first marriage for the spouses, how long the couple has been together and if there are kids from previous relationships. Most often people do not include their in-laws in their estate planning as they prefer their family assets to stay within the family.