In the episode "Maudie", from the previous season, Mr. French was reacqainted with an old girlfriend from their days in Upper Kent. Maudie, as he knew her, was a barmaid there, and in that episode French was asked to accompany Bill to Britain, where Bill was to go over plans for a new building project in South America for Marchwood, Ltd., a major Corporation in Britain run by Lady Marchwood. Lady Marchwood, it turns out, is Maudie. While in Britain, Maudie asked Mr. French to marry her, and run the company. Though temped, French politely refused, and returned with Bill to New York. This time, Lady Marchwood is in New York to see a horse she owns in a race. French is about to ask Maudie to marry him, when she reveals her plans to marry another man. French, we know, is hurt, but doesn't show it, and the Davises are glad to have him back. He is, after all, a member of the family.
This episode is reminiscent of the "My Three Sons" episode "The Best Man" (which I reviewed), in which Robbie was also about to propose to a girl when she, too, tells him she's about to marry someone else, except French, unlike Robbie, never lets Maudie know he was about to propose, and, also unlike Robbie, harbors no bitterness. That's understandable, as Robbie was still a teenager, while Mr. French is a proper gentleman.