You're going to have to go into the cubuffs.com website and buy them separately. There's a section for students and a section for non-students, and you can't get them together.

While you may only be able to buy the tickets separately, once you are in your appropriate gates y'all can meet up and sit on the student section together. Because the students' section is open seating no one is there to tell your guest to go back to their designated seat. At lest once a year I have my parents and other friends come and there has never been a problem with them sitting with me. Just remember, they cannot enter through the student gate.