Given the question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What is the relationship between Isabelle and Julien? Title: The Butterfly Movie plot: Julien, (Serrault) an aging widower, is a passionate butterfly collector. Elsa, (Claire Bouanich) an eight-year-old girl, with her mother, a very young woman named Isabelle,(N just moved into his apartment building. The mother is usually away, leaving her daughter alone for long periods of time, and Elsa starts visiting Julien. One day, Julien decides to go to the Vercors plateau in search of a rare butterfly called Isabelle which can live for only 72 hours. Elsa decides to join his adventure without telling him, and hides in his car. During the search Julien eventually reveals that butterfly collecting was a passion of his son, who died very young. His son had asked Julien to find the Isabelle butterfly, and so this is why the butterfly was so important to Julien. The story complicates when Elsa's mother reports her daughter kidnapped. The police sent out a search party looking for her. Elsa ends up falling into a hole while traveling with Julien. Julien calls the authorities who come to rescue Elsa. However Julien is suspected of kidnapping and is taken into custody for a short time. A young boy named Sebastian helps get Elsa out of the hole, and she is able to go home with her mother. It all ends very happily as Julien is released when they realize that he had never kidnapped Elsa. Isabelle, Elsa's mother, allows her to continue seeing Julien and studying butterflies with him. Both Julien, Elsa, and her mother benefit greatly from each other's presence.
The answer is:
They are neighbors