Why do the Mannings sound like they have a Different accent ??

I know I have a mix of accents. I grew up here but don't have a full n'awlins accent, more neutral. Went to college in carolina and spent time growing up in north louisiana, which added a southern accent that comes out in certain situations (lots of beer drinking or when hunting or fishing). And a sort of official accent for business. I think it's not uncommon to internalize different accents based on where you've lived and what company you are in. I wonder if Peyton had that accent, for example, before he went to Tennessee?