I also have a very close relationship with my family, but I certainly would not (and have not) brought any family members with me to interviews. I don't know how old you are (perhaps you are much older than I), but I am a college senior and feel that I'm in the stage of life where I have to learn to tackle bigger and bigger challenges on my own.
Every med school interview is just such a challenge. You travel through an unfamiliar city, possibly farther from home than you've ever been before. You show up to the admissions office and are thrown into a room with a bunch of strangers and you know that you are being watched. The pressure is on! Socialize or die! You're not being scrutinized as much during the tour, but you still have to know the right questions to ask the tour guide. You will need to ask the right questions if you're going to be able to figure out if the school is right for you. Are you into fitness? Ask about the gym! Do you have a tight financial situation? Ask about aid! Not used to commuting? Ask about how close affordable housing is, public transportation, student carpools. The list goes on.
The reason I wouldn't bring a family member to an interview is that I am afraid I would use them as a crutch. I would talk to them instead of the other interviewees. I would let them do the research ahead of time and figure out the important questions and then talk to the tour guide and ask those questions. "Well blahblah my 401k and blahblah alternative minimum tax: does your student aid package include dividends full of five percent interest?" (Sorry, I'm still learning this whole money thing.) And because I shied away from doing the research and asking the right questions, my parents would end up knowing more about the schools than I did. Then how would I choose which school to attend? Would I use my parents as a crutch again? Where does it end? When will I learn? What will I do fifty years from now when I am trying to manage my retirement fund and I am totally clueless because I kept pushing off growing up? I exaggerate, of course, but the basic premise is true. Doing these things on your own is part of learning how to be an independent adult.
Med schools are looking for independent adults. Whether or not they can conclude that you are not an independent adult because you brought your mom with you to the interview is debatable, but what's more important is how you answer this: Are you using your parents as a crutch? Are you shying away from learning how to be an adult?
I agree with @
southernIM. You wouldn't bring a parent to a job interview, and that certainly isn't a question of fit. Unless you think you are not a good fit with 100% of all employers out there.
