The Fan

From a framing device in post-WWII London, confirming the source is Oscar Wilde's play, Madeleine Carroll as ancient Mrs. Erlynne reveals herself to aged Lord Darlington (George Sanders), decades before with Cecil and Arthur (John Sutton, Richard Greene), in Otto Preminger's The Fan, 1949.

Lord and Lady Windermere (Richard Greene, Jeanne Crain) attend a fencing match to watch Darlington (George Sanders) and Graham (John Sutton) compete, as evil Mrs. Erlynne (Madeleine Carroll), with Augustus (Hugh Dempster), alarms the duchess (Martita Hunt), in Otto Preminger's The Fan, 1949.

Lady Windermere (Jeanne Crain), at the home of the man for whom she plans to leave her husband, is confronted by Mrs. Erlynne (Madeleine Carroll) who is blackmailing that husband but is not his mistress and who, she does not know, is her own mother, in The Fan, 1949, from Oscar Wilde's play.

Resuming Otto Preminger's flashback device with geriatric Madeleine Carroll and George Sanders as amorous Lord Darlington, meeting Lady Windermere (Jeanne Crain) then the duchess and daughter (Martita Hunt, Virginia McDowell), in The Fan, 1949, the famous line from Oscar Wilde's play.