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The key with first person point of view is that your character's voice has to come through. So if you write three separate first persons, they all have to sound different meaning the writing style...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/8515 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The key with first person point of view is that your character's voice has to come through. So if you write three separate first persons, they all have to sound different meaning the writing style has to be distinct for each one. You can't just slap a character name on the chapter and hope your reader can go by that alone if there is no other context or way to distinguish who's speaking. It might be easier to choose a main narrator, write that one in first person and then write everyone else in third person.