As your a parent it's very difficult to take a decision. I guess, Because you love your child so much! Just take him and explain him that, you all are going on vacation to spend the time and to study with new friends and explain him it will be a long stay. The time, place will change everything, not to worry evey thing will be alright and it will come back to usual. And we are very glad to hear that, how much you love Srilanka and Good luck for your future life.