[stepvhen]

is for->fer Utah? I'm in Indiana, born on the West Coast, and I dont know where I picked that up. I have also started to morph "car" and similar in the direction of "kerr," and (most embarrassingly) instead of "robot" in conversation ill say "robit." I havent been able to find out from those around me, or hear the same changes.

[Jach]

No idea where it'd originate from, but in central Utah it's common. A few others I've remembered include (similar to fer) your -> yer, our -> are, really -> rilly, prescription -> perscription, sale -> sell.

Robit is pretty funny, like a frog? Haven't heard anything like that.

A random YouTube search shows what I'd consider representative for the area, at least around my age, only a couple of fers though. Overall fairly "neutral". https://youtube.com/watch?v=k3IdMkc-aD4 Your sibling mentioned a similarity with Appalachian people, maybe some of it is a mountain thing, though if they had in mind anything like https://youtube.com/watch?v=Bn8O6Nx3C6w I don't really hear much similarity.