Detailed Instructions: In this task, you will be shown an extract from a movie plot and a question. You need to provide the correct answer for it. Short answers containing words that are present in the passage are preferred.
Q: From the director of La Mujer de mi Hermano and the writer of Voces Inocentes comes Mancora, a road-trip drama that traces the shifting emotional boundaries between three disconnected individuals.Mancora begins with Santiago (Jason Day), a 21-year-old from Lima who is disturbed by his father's recent and unexpected suicide. Wanting to leave the chill of a grey Lima winter, Santiago decides to go to Mancora, a beach town in the north of the country where the climate is warmer. Right before his departure, Santiago receives an unexpected visit from his stepsister Ximena (Elsa Pataky), an energetic, sexualized Spanish photographer and her husband Inigo (Enrique Murciano), an art-collector from New York. Their peaceful getaway is quickly disrupted by an act of boundary-crossing and betrayal, which might change their relationship forever., Question: How are Santiago and Ximena related?
A:
Answer: Step-siblings.