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Source: https://writers.stackexchange.com/a/36355
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/36355
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

In _Harry Potter_, J.K. Rowling alternates between "Aunt Petunia" "his aunt" and "she".

In _Something Wicked This Way Comes_, Ray Bradbury has the following:

> Far off, the old man smiled.  
> They approached each other, carefully.  
> 'Is that you, Will? Grown an inch since this morning.' Charles Halloway shifted his gaze. 'Jim. Eyes darker, cheeks paler; you burn yourself at both ends, Jim?'  
> 'Heck,' said Jim.  
> 'No such place as Heck. But hell's right here under "A" for Alighieri.'  
> 'Allegory's beyond me,' said Jim.  
> 'How stupid of me,' Dad laughed. 'I mean Dante.' (_Ray Bradbury, Something Wicked This Way Comes, chapter 2_)

In the same passage, he uses "the old man", "Charles Halloway" and "Dad", all referring to the same person, same character's father.

I'd say, the third person narration can reflect how the MC thinks of the character they're talking to, and how you want the reader to think of them. Harry Potter doesn't think of his aunt as "Mrs. Dursley", nor as "auntie", so you wouldn't see those terms used.  
You would see "Mrs. Dursley", for example, used if you wanted to distance the reader from Harry's POV, make them see the scene without Harry's bias, as it were. Such usage would be somewhat jarring, which you could use to deliberate effect.

Original score: 7