carwyn scott-howell got lost on the slopes and left the piste before walking through a treacherously steep wooded area , according to a source .
the welsh schoolboy , who was formally named by police today , was holidaying in the french resort of flaine with his mother ceri , elder brother gerwyn , 19 , and nine-year-old sister antonia when the accident took place .
police are still trying to piece together the tragic sequence of events , but they believe the little boy was killed .