Jon Francis Daley and Jonathan M. Goldstein’s Vacation (C) reboots the classic comedy franchise with an affable Ed Helms as “Rusty Griswold” taking his family on a cross-country car trip to the fictional West Coast Wally World theme park. Amidst the barrage of gross-out humor, there is a legitimate glimpse at a modern American family with genuine marital struggle, raucous sibling rivalry and a road to redemption. Most of the predictable humor springs from unease and awkwardness, and there could have been a whole lot more inspiration in the episodic stops along the way. There were very few surprises but still a good deal of laughs on this holiday road. Let’s hope if this clan does Europe next, it will be less by-the-books.