I didn't know much about Duck Dynasty, until this controversy with A&E.
I don't have a TV, but never watched reality shows anyway when I did, other than a few Ice Trucker episodes, and some Alaskan crab trapper show.
Here is a video with Phil talking about Terry, and the different career paths they each took.
https://www.youtube.com/watch?v=aBQJycl1_gQ#t=92