Distraught relatives and friends gathered Friday for the funeral of a sweet 11-year-old boy who was killed subway surfing — as his grandmother blamed his school for the tragic death. Cayden Thompson slipped out of Fort Greene Preparatory Academy Monday morning before his deadly ride atop a G train,

The family of the 11-year-old boy who died subway surfing on a Brooklyn train wants to know how he slipped out of school undetected the morning he pulled the deadly stunt. “When he leaves my hands, he goes into their hands,