My kids are pulling hard to see this one, which we'll probably do next week. I found this overview from the LA Times helpful:
Sam Harper's clever script turns upon a universal tug, which is the reluctance of parents to let their kids go. Faced with the news that pregnant daughter Nora (Piper Perabo) and her husband (Jonathan Bennett) will be moving to Houston and that daughter Lorraine (Hilary Duff) is off to New York, Martin's Tom Baker decides the family should have one last vacation together, at their beloved Lake Winnetka, Wis.
The Bakers' 12 kids are reluctant, but Dad, with a nudge from Mom (Hunt), persuades them to agree to the plan. Clearly, the Bakers, based in the Chicago area, haven't vacationed there for some years, and the remorseless course of change that gives this comedy its shading hits home when they're faced with the ramshackle condition of the place they so enjoyed in the past. Tom rallies the troops, but a more daunting prospect looms across the lake: a lavish log palace, only slightly smaller than Old Faithful Inn, constructed by Tom's lifelong rival, Jimmy Murtaugh (Levy), who has but eight children, about a zillion bucks, a gorgeous third wife (Electra) and who now owns almost the entire resort community.
Murtaugh's strict discipline has resulted in offspring who excel at everything but experience feelings of mounting rebellion toward their obnoxious martinet father. Since childhood Jimmy has been jealous of Tom for his popularity, especially with girls, and, to be sure, this ancient rivalry will flare up, but not before the Baker and Murtaugh children get to know and like each other.
The irony of considering a family of eight children as small isn't lost on me. I wonder what affect the movie will have on my children. Will they want a few more siblings so they can get past the Murtaughs? One thing for sure is, with a movie like this, it'll take a little off the freak edge when my wife and I go into public with our seven.