UtterDevotion gave a phenomenal list of questions to ask interviewers, which she posted in another thread. I'll list them here, with props to Utter Devotion:
Come up with questions to ask them....
Faculty:
--How heavy is the coursework? Would I have free time to work and/or volunteer?
--What would you recommend a student to be involved in their first year?
-- Things specific to the school (aka how they grade, classes, etc)
--Why did you decide to be a faculty member here at the University? Do you do any sort of research?
Students:
--Is it difficult to find housing?
--How they enjoyed their experience at school.
--What is something you wish you knew when you were interviewing and/or applying to schools?
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From those, you might be able to come up with some others that will apply more specifically to your situation. Also, take a notepad with you in case something that is said triggers a question.
For example, if you're planning to live with the parents while you're in school, you might want to gear questions toward that: does anyone here live with their parents? how's that working out for you? Do you recommend I get out of their house with all its distractions? Or you could possibly address a commute; if you live close by but will still have a commute, what's reasonable?
Good luck!