Maybe Some Other Time (1988)

Mr. Modabber who is a dubber see his wife Kian sitting in a car of a stranger in one scene of a documentary he is been dubbing. With the help of the director and the editor of the documentary he finds the stranger who has a pawn shop. But when meets him he finds that the woman is not his wife but her twin sister Vida. While faking that he making a documentary he brings his wife to meet her twin sister. Kian finds that in her childhood her father passed away and her mother.