Undercurrent (1946)

Director: Vincente Minnelli
Cast: Clinton Sundberg, Dan Tobin, Edmund Gwenn, Jayne Meadows, Katharine Hepburn, Marjorie Main, Robert Mitchum, Robert Taylor

Synopsis:

After a rapid engagement, a dowdy daughter of a chemist weds an industrialist, knowing little of his family or past. He transforms her into an elegant society wife, but becomes enraged whenever she asks about Michael, his mysterious long-lost brother.