The families of three British teen girls who are thought to be making their way to join ISIS in Syria are urging them to come home. One sister pleaded on the BBC for her not to "do anything stupid," and said there was no sign that she was planning to run away. "Remember how we love you," the father of another said. "Your sister and brother cannot stop crying. The girls, 15 and 16 years old, boarded a flight to Turkey on Tuesday. A Glasgow woman who joined ISIS in 2013 may have been in contact with one of the girls online.