Yolanda,
The same approach we use for our students could work for their parents as well. When a student or parent communicates that the cost of tuition is more than they expected, a great question to ask is 'compared to what?' The answer they provide will give you a point of reference so that you know what resources you need to utilize to meet the challenge. As you point out, sometimes they simply don't understand and need additional information to bring clarity to the situation. Give it a try and let us know how it works for you.
Dr. Jean Norris