marc wabafiyebazu , 15 , has been arrested for felony murder and his brother jean , 17 , was shot dead on monday .
this after an incident in which the two reportedly tried to rob a group of miami drug dealers .
their mother is roxanne dubé , the recently appointed canadian consul general in miami .
the boys had driven to a house with a third friend to reportedly purchase two pounds of marijuana for $ 5,000 .
gunfire erupted soon after they entered , though marc was in the car at the time .
another man , joshua wright , was killed , and anthony rodriguez , who was wounded , was also arrested on charges of felony murder .