That's called distancing language. He doesn't recognize his own son as a person. It's sorta like the monica situation with bill clinton, as soon as the stuff stated he refered to her as "that woman" and stuff. It's disinterest and his way of trying to ignore or reject that the child exists or is his. My question is this, why are you trying to push communication with someone who doesn't seem to want his own son? Or maybe he's trying, but it's going to take time - pushing him will only make it worse. I'll need more information to be able to help more.