It is nothing gross in this case. I just found it a bit weird.

There was a couple in the same college titled "Instructor". They were tutors in the same department. They have been in a relationship like years and they are going to get married this year.

The weird point is, one of them becomes a "PhD Candidate" in this semester. They are still in the same department and of course, the "PhD Candidate" is still doing teaching work while earning his doctor degree.

Is it a Student-Teacher Relationship?