premise: Zoey Patricia Bartlet is a fictional character played by Elisabeth Moss on the television serial drama "The West Wing". Zoey is the youngest of President Josiah Bartlet and Abbey Bartlet's three daughters, and is featured more prominently in the series than either of her sisters.
hypothesis: Zoey has twin sisters.
reason: Zoey has two sisters, so they could be twins. The model might assume the statement means Zoey is a twin, which is unlikely [but not impossible] given she is 'youngest'.