Answer:
Andy
(I'm not completely sure of this answer see the explanation and decide for yourself.)
Step-by-step explanation:
Is quite debatable I've seen multiple sources that say that Andy (The narrator) is the protagonist whoever, even tho the story is narrated by Andy and there are Andy moments specifically the over all story is of the Duvitches. There are many stories where this has happened and the narrator ends up being the protagonist but there are also many that are turned around. I can't say for sure if the sources are trust worthy. Readers are able to more closely identify with the narrator. Readers can more easily identify the theme of the story. Readers quickly learn about all of the characters, including the narrator. Because of this I would say that Andy is kind of like our part in this story. Our "incarnation" if you will. We feel closer to him because we see everything throw his eyes. Even the Duvitches.