I just want to take a moment to recognize the parent for taking this approach and asking instead of what I hear from many others. I hear so many stories of parents telling applicants what they should have done differently on their application while having no knowledge of the application process or worse, parents being upset with successful applicants for not getting into a T10 program.
Best thing to do is to ask them what they need and as others have said, to let them know you fully support them no matter what. It took me multiple cycles to be successful and after each failure, I needed some time before being willing to discuss what happened. While my parents were not the best at having the conversation when it came to that point, I always appreciated having the space to grieve and process in my own way prior.