There are several venues at work here. One is a flashback to Jack taking Kevin and Randall on a camping trip. The two are in conflict from the onset. Kevin has no use for his brother, but he can't put it into words. Randall is so anal that he actually makes a list of what order they will do things on the trip. Kate and Rebecca are set for a girls' day when Rebecca gets a call that Jack's dad, whom she has never met, is near death. Rebecca goes to see him and it is really a hard set of moments. In other interesting events, Kate tells Toby about the pregnancy. As this is transpiring, Kevin is finding out more and more about failure. He has become addicted to painkillers. This is working at portrayal of foundational stuff.
