Relatives of a missing New York City woman who disappeared during a vacation to Turkey, her first trip outside the U.S., are heading to Istanbul to look for her, her brother said Sunday. Sarai Sierra's family was last in touch with her on Monday, the day she was supposed to start her journey home. The 33-year-old mother of two had been in Turkey on her own since Jan. 7. Her brother, David Jimenez, told The Associated Press that he and Sierra's husband, Steven, were planning to leave for Turkey on Sunday night. He said he had no return date planned. "I don't want to come home without my sister," he said.