When grumpy grandpa Roger Hobbs (James Stewart) suggests a quiet vacation to his lovely wife Peggy (Maureen O'Hara), he's thinking of a romantic break for just the two of them. What he gets, however, is something quite different! Before he knows what's happening, Peggy has organised a full family reunion - in the oldest, ugliest and most dangerous beach house ever!

Now Roger's life has become a living nightmare as he struggles to cope with delinquent toddlers, TV-obsessed teenagers, a pair of very odd sons-in-law and a young daughter falling for a local heartthrob (Fabian). Returning to work will seem like a dream after this vacation!