Task: Question Answering
Input (English): Passage: On October 9, 2006, Kristi Rey and her husband Daniel are killed by her demon-possessed sister Katie, who then abducts Kristi's one-year-old son, Hunter. Text states that Katie and Hunter's whereabouts remained unknown.
Five years later, in November 2011, Alex Nelson lives in a wealthy suburb of Henderson, Nevada with her father Doug, mother Holly, and little brother Wyatt. When their new neighbor falls ill and is taken to the hospital, her son, Robbie, is left in the care of the family.
One night while Alex is sleeping, her boyfriend Ben's computer starts recording her laptop webcam, and he sees Robbie getting into the bed with her. The next day, Wyatt tells Alex about Robbie's friend, Toby. After strange events happen, Alex and Ben set up cameras all over the house. On the third night, the strange happenings escalate until one day, Alex finds a trail of toys that leads to a closet. She finds Robbie, who says, "He doesn't like you watching us," as a chandelier falls and almost kills her. 
Question: Who is Wyatt's sister in a relationship with?
Output (English): Ben.