My T has "discovered" a couple different parts- a caretaker part and a more vulnerable part etc, in the method of inner family systems therapy. She never actually talks to them, but she does talk about them. I made it pretty clear at first that this concept makes me uncomfortable, but over time it has just become a convenient handle to address different thought processes. I think she's kind of met me halfway on it and doesn't press the issue.

I'm glad you brought this up. I'm interested to hear what other people have to say about it.