The same exact thing seems to happen to people who move to the south. They leave with a pleasant northeastern accent, then six months later they're y'alling this and y'alling that and twanging like a drunk country singer, it's annoying as fuck, haha!
I'm sorry about his papa. I felt the same when I saw my dad- not him, just a shell.
How the fuk can that happen, really? I keep my accent. Its mine. I hate that fitting in weirdness. It sounded horribly odd. He is lucky he doesn't get bullied from real Irish folk.
It is horrible eh, you realise that they are gone and that thing you are looking at is not him :O(