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

I grew up in Metairie, and lived there until I was 22. I don't have a Yat accent.

My brother grew up in Metairie and has lived their his whole 45 years. He doesn't have a Yat accent.

My sister grew up in Metairie, lived there until she was about 25. She had a pretty serious Yat accent.

Go figure. We all grew up in the same family in the same house with each other.

I have lived outside of New Orleans for 18 years now, and no one has ever guessed that I am from there before I told them. And most say, "You don't sound like it."