DR MAGWAZA
It's not very usual that when children have been through such trauma would thereafter be normal.  If it's possible for you we would request you to go to school and try to find out what their performance is like, because it's possible that at times, as a father, you tend to overlook certain things, especially with regard to children.  You may not be very close to your children, especially that they are girls.  Maybe it could help if you could go to their teachers and find out as to their progress.  