The sound of singing and music drowns out the ambulance sirens in this school for displaced families in Khan Yunis, in southern Gaza. Thousands of children have lost their homes and had to flee since the Israel-Hamas conflict began.Now, volunteers like Mohammed Aborjela spend their days going from school to school and offering these children a glimpse back into their childhood with games and fun activities.  'The kids come back really happy, they revive their playful spirit,' said one parent. While it won’t bring back their homes or loved ones, volunteers are hoping that making time for play in a war zone will help these children recover from the trauma of living under siege.