George Banks (Steve Martin) feels far too young to be a grandfather and way too old to become a father again. So when his recently married daughter Annie and his wife Nina (Diane Keaton) both announce they're pregnant, the news sends George headlong into a wacky mid-life crisis as he desperately tries to recapture his youth. But the fun only doubles as the Banks household gets turned completely upside down by party planner extraordinary Frank Egglehoffer (Martin Short), who returns to throw the baby shower of the century just as everyone is anxiously awaiting the delightful double deliver!