I can't help you with getting his lines, but I know quite a bit about Mr. Martin if it helps. I've been able to gather quite a bit of info on him from what I heard from him ingame. He had a rough childhood, and of course married, had 2 kids, and divorced, from what Wade says. He runs a seafood resturant according to his errand, but I heard some things that indicate he's unemployed and can't get a job (Maybe he was unemployed and possibly a hobo in the beta?) and he doesn't have much money. Something must have really made his relationship with Mrs. Martin really hard to withstand, I never heard him talk about her (I stalked him and heard a lot of lines, he interested me.) which would also explain why Christy doesn't talk about it, and why she often talks about commiting suicide, as it may have really affected her.
Wade talks about hating his dad quite a bit, so he may have gotten it, or it hasn't sunk in what really happened, whatever did happen. She could have been cheating, or he could have, or anything. The divorce probably bankrupted him, and that's why his lines implicate he's unemployed and poor, the errand was probably an oversight.