One of the dangers of leaving an inheritance to a married adult child is that the child’s spouse will indirectly claim entitlement to the inheritance, one way or another. For instance, suppose your adult child passes away prematurely, which often will result in leaving your son-in-law or daughter-in-law in sole possession of any assets that belonged to your child. In this case, your child’s spouse may use the funds as he or she sees fit, which may frustrate the intent of your inheritance, particularly if you wanted the funds to go to your grandchildren.