I disagree. My fiance came with me to interview day and I think, rather than showing my lack of independence, it showed that we are committed to this med school endeavor together. Plus, if his income and lifestyle is going to contribute to my success, he has every right to be there, especially to hear about the financial aid and housing. Heis going to uproot his life to move to a new area, so should be able to make the decision with me.
Perhaps bringing your mom to the interview day would be different, because that could represent that you are not ready to detach. Though many in my interview group travelled to TN with their parents, the moms and dads only came to the pizza night and not the interview day.
If you are planning to bring someone to the interview day, be sure to let Paul Carney know so they have a count for space in the van and for lunch. But he will tell you that your guest can go everywhere with you except for the interview itself. Hope this helps! Good luck at your interview

You will do great!