Poor Steve Martin and a mob of kids return in this wacky, slapsticky sequel to 2003's "big family" comedy. This time they go on vacation. How wacky is that? Vacation! ... I don't know, it all seems kind of passé in the wake of Yours, Mine and Ours. That movie family had 18 kids. How wacky is that? Eighteen kids! At least Steve Martin gets racked in the testicles a lot. 94 minutes PG.