The answer to that question is, your new son-in-law's parents. A wealthy white family is informed that their daughter's intended is coming to meet them, and he's black. Scripted in the late 60s, the idea of a bi-racial marriage was still fairly shocking. To smooth this over, the son-in-law to be is a prince. He's a Doctor who lives in Switzerland and intends to take their daughter there to live. Set in California, it's not quite a return to Selma, Alabama, but was controversial in its day.Joey Drayton (Katharine Houghton, actually the niece of Katharine Hepburn), brings her fiancé, Dr. John Prentice (Sidney Poitier) home to sunny San Francisco to meet her affluent parents (Hepburn and Spencer Tracy). Their liberal persuasions are now put to the test, for although the young man is an ideal choice (he's highly and internationally respected in the medical field, and he's impeccably mannered, handsome, well dressed and of a respectable California family), he's black. The film, which covers one busy day in the Drayton home, is essentially a drawing-room comedy, a series of cross-conversations between the young doctor and the girl's parents, and finally between all sets of parents and offspring. A simple dinner is extended to include the doctor's parents, who fly up from Los Angeles for the evening, and the crusty but benevolent old Irish priest, a friend of the family (Cecil Kellaway). Thus, the title of the film . . .