The parents should be arrested.

They didn't specify who, but there was one arrest, one of the parents I imagine.

seems it's the mom that left her 4yo in the car;

http://www.ctvnews.ca/canada/caregiver-charged-after-boy-dies-in-hot-car-in-toronto-1.3601264

Sometimes I think people have kids because they just want to have something to brag to their neighbors but they don't really care for their kid. 

This happened in the us. Once the dad realized, he put the kid in the fridge to cool it down.