I read this part and smiled, because that's exactly what this is. I've tried to bring a lot of that into the story, and bring it in from multiple age ranges.
1. We have that initial, glowing reaction to fatherhood, as experienced through Wade.
2. We have Wade's relationship with his own father, who he is rebuilding a bond with.
3. And we have Will's relationship with Brad.
Of the three, Will's relationship with Brad is going to be the most contentious, because he's a teenager, and that's when father-son relationships generally endure the biggest trials. You have two very strong-willed people, both with conflicting goals and responsibilities. Will is trying to be independent, he's trying to be 25 years old, which is absolutely normal for kids that age. That he doesn't have that capability won't really come into his mind, He'll see things through his own extreme biases, and he'll live his life based on what happened today. He'll be tough to reason with, and he'll be a pain in the ass to handle, until he finally goes through enough of a crucible, and matures enough, to settle down. These are not fun times. If you have never dealt with one of these individuals, they probably seem maddening to you. Why don't they listen? How can they be so irrational? He's being very unfair to Brad and/or Robbie. Yep. He is. But, he also has some points to make. One of the big issues is attention, and he's frustrated right now because he feels very alone and isolated. That's a classic teenage emotion.
The classic old-school solution to this is to lay down the law, and make the teen behave. That's what happens when it becomes a power struggle. That's when it gets ugly.
Much of what I've covered here, and will cover, is a much-dramatized reiteration of the conflicts I've had with my own son. How do you raise an extremely bright guy, who won't do what you want him to do, even when it's clearly in his own best interest? Do you abdicate responsibility and let him make his own decisions? (You may end up with pole-dancing). Do you try and reason things out with him? They aren't always (usually) real communicative. If I've done one thing in error, it's to have Will talk about his issues so much. Or do you just lay down the law, and say it's my way or the highway? Then you spark massive rebellion. You always will. Some kids internalize it, some externalize it, and some do both. It's real easy to talk about finding a compromise solution, and maintaining a nice balance, but that's just talk. Actually finding that, well, that's the real challenge.