Mourning Becomes Electra (1947)

...Mother and daughter in love with the same man ... rivals in ruthlessness even to murder!

Near the end of the Civil War, the proud residents of Mannon Manor await the return of shipping tycoon Ezra Mannon and son Orin. Meanwhile Ezra’s conniving wife Christine and daughter Lavinia vie for the love of a handsome captain with a dark secret while well-meaning neighbor Peter sets his sights on Lavinia.