AllMovie

Su Hermana Menor (Her Younger Sister) was the maiden directorial effort of Argentine scriptwriter Enrique Cahen Salaberry. The title character, played by Silvia Legrand, is a servant girl who idolizes her glamorous older sister Zully Moreno, a high-profile fashion model. The girls had made a childhood pact that they would be together once every 12 days, no matter what. This sibling bond is threatened when Moreno falls in love with Legrand's sweetheart. But blood's thicker than anything else, and in the end Moreno magnanimously sends the erstwhile Romeo back to the wide-eyed Legrand.