Is is inappropriate to bring a +1 to a gradate school recruiting weekend? I have a recruiting/visit weekend coming up for one of my prospective PhD programs (to which I've already been admitted). Travel is covered, and my hotel is paid for. Food is provided the entire weekend. I had intended to bring my girlfriend. She is my SO of 6 years; we live together and moving somewhere for school would be a big decision on both of our parts and she really should be visiting the city/school before I accept anything. 

She of course doesn't need specific details about every aspect of the program, as I will no doubt receive, or to meet faculty, and of course the university has no reason to pay for her weekend. My parents also were hinting that they wanted to come, but that's an even bigger stretch, it seems.

Am I overthinking this? Or is it really not appropriate to be bringing a +1 to a recruiting weekend. I can always bring my family members there soon after to show them around.
Bringing a significant other who would be relocating with you to a recruiting weekend is acceptable. In fact, some schools/departments would encourage it. We routinely welcomed SO to our recruiting weekend and saw it as a "good sign" when prospects brought such a person.

I would not bring your parents (would make you seem juvenile, and I have never seen this in practice) and I would also hesitate to bring a significant other who would not be relocating with you.

The next question is which events the SO should attend. This is probably a good question for whoever is planning the recruiting weekend. I would expect the SO to attend social and student-only events (meals, tours, social evening), but not academic events.