On his wedding day, Robert confesses his father-in-law that twenty years ago, he seduced a lady in a sleeping car of a train. His mother-in-law overhears the conversation and convinces Robert that she was that lady and that makes Robert’s bride also his daughter. The wedding is in danger of being annulled when the trickery is finally discovered. More on Wikipedia
Watch Compartiment de dames seules/ Ladies Only Compartment (1935) French Film
English subititle