Here in Canada, such a death would bring multiple criminal charges, starting with Criminal Negligence causing death, failure to properly secure a firearm, failure to properly store a firearm, and if the hand gun was an illegal one, meaning the Parents did not hold a Firearms permit, they would be prosecuted for that, too. Prison time would ensue, if convicted at trial.
In Canada, it is HARD to get a hand gun permit, and the regulations about storage, and transportation are strict. A legal hand gun owner MUST secure the weapon at all times in a gun safe, unloaded, with a trigger lock on it, with the ammunition stored in a second secured lock box in their residence. The ONLY time a legal hand gun can be fired, is at a designated range. The hand gun cannot go anywhere else, except back and forth to the range, then back the permit holder's residence.
No one in Canada is allowed to carry a hand gun in public EXCEPT for on duty Police officers., armored truck guards while on duty, or Canadian Armed Forces members while on duty. In a country with a population of over 40 million people, less then 7,000 Canadians have a license to carry a hand gun as personal defense against dangerous animals. These are people like trappers, exploration crew members, and those who work in isolated parts of the far northern arctic regions. Rifles and shotguns are licensed, and again the laws about their use are strict. You cannot drive around with a firearm in your vehicle during non hunting seasons. Going hunting ? Be licensed, have your tag, and obey the rules about where and when you can hunt. JIMB.