The Other Man's Wife (1919)

Three New York families are introduced: wealthy Fred Hartley and his wife, who, feeling neglected, encourages the attentions of debonair J. Douglas Kerr, the middle-class Moore family, consisting of mother, daughter, and son Jimmie who supports them, and the Simons, an East Side Jewish family. When America enters the war, Hartley, Jimmie, and Davy Simon enlist. When Jimmy says goodbye to his sweetheart Becky, one of Davy's three sisters, her father refuses to consider him as a future son-in-law. Kerr sends Mrs. Hartley a cablegram reporting Hartley's death in the war. She puts off responding to Kerr's proposal, and after the armistice, Hartley finds her trying to break free from Kerr's embrace. When Kerr hastily exits, an irate butler grabs his trousers. Mr. Simon accepts Jimmie as Becky's fiancé, and Kerr is last seen squatting so that his overcoat covers his backside.