Roy's father teaches his son to act rationally and talk about problems. He gives guidance and advice, and trusts Roy to make good decisions on his own.
Roy has talked about fighting with his father. His father has advised that "It's important to stand up for what's right...but sometimes there's a fine line between courage and stupidity". Roy remembers and weighs his father's words before deciding to confront Dana in Chapter 9.
When Roy really gets out of line, his father calls him into the den, where Roy must do some "serious explaining". In the past, a spanking was administered when warranted, but "it had been years" since that had been necessary. After Roy allows Mullet Fingers to use his name to get treatment at the hospital, Roy's father makes Roy tell him the whole story in the den. He listens carefully, then, realizing the complexity of the situation, tells Roy, "I'm going to spend some time thinking seriously about all this...you should too". Roy's father is not afraid to admit he does not always have all the answers, but he always upholds the principle of thinking before acting, and he leads by example (Chapter 13).
Above all, Roy knows he can count on his father's support. Knowing that his intentions are sound, Roy's father even writes a note to get Roy out of school so he can attend Mother Paula's groundbreaking, only admonishing that Roy "be careful...and be smart" (Chapter 19).