The best advice I can give is to just be yourself. I know it sounds simple, but your son/daughter would not have gotten this far if they were not great kids. The interview team wants to get to know them - not interrogate them. They are very gracious and realize that the candidates are nervous. My daughter left feeling like she had blown it because she did not know the answer to a financial question. The team is not grading you on your performance, but trying to get a feel for how you would represent the Terry Foundation and how being a Terry would impact your life in a way that you impact others. Certainly you need to be prepared! At the end of the day, the scholarship is a competitive award; however, the interview team is there to help - not to intimidate. Tell your son/daughter to relax (as much as possible) and believe in themselves.
While not the author of all of the posts, Heather Medley, the Terry Program Director at Texas Tech is the blogger of choice here.