Lots to read between the lines here. It doesn't surprise me that Brad's marriage to Jake is on the fritz.
Keep in mind that in the CAP world its only been 2.5 years since 9-11. In the real world that's not a lot of time to work through the death of someone you loved, especially when you lost them in such a tragic way. I don't think Brad has truly worked through his grief over losing Robbie. Did they have their problems? Yes. But the love they shared throughout the years was indisputable. Would they have lasted? Who knows?
I think Jake was a rebound. Brad needs more time, less drugs and a little understanding from his kids. I think Will is coming round to that conclusion.
Taking care of a parent is hard, no matter what age you are. Taking care of a parent like Brad is challenging at best, impossible at worst. I think Will is up for the challenge. He has JP and Stef to rely on. Worst case scenario, he can pull out the big guns and call in his Grandmaman. Isobel will straight shoot Brad the "Mom" look. (Works for my my kids...lol)
Great chapter Mr. Arbour!