Sweet-natured Alice Sycamore (Jean Arthur) falls for banker's son Tony Kirby (James Stewart). But when she invites her snooty prospective in-laws to dinner to give their blessing to the marriage, Alice's peculiar extended family -- including philosophical grandfather Martin Vanderhof (Lionel Barrymore), hapless fledgling ballerina sister Essie (Ann Miller) and fireworks enthusiast father, Paul (Samuel S. Hinds) -- might be too eccentric for the staid Kirbys.