Of course we don't know what happened but I am sure the family is devastated. To them this is no joke. but a tragic accident. Indents happen all the time all over the country. The kids saw a gun and think it a toy. If the adults are going to have guns in the home they need to be out of sight of they happen to see one they need gun education.
Gun education? What on earth is that? Does an adult need a class to learn that guns should not be left within reach of a child?
The phrase "thought it was a toy" implies that a child would know to not pick up a real gun, and the cause of this devastating tragedy is a mistake in identity by a toddler. A toddler does not mistake something for a toy. A toddler thinks everything is a toy and if it can be picked up, it's a very convenient toy.
Now that we have established that fault lies with a two year old's faulty judgment, we can write this off as a case where the system malfunctioned, but it's not a system failure.
This brings me back to a point I have made, many times. The death of this child is not a tragedy. A tragedy is "an event causing great suffering, destruction, and distress, such as a serious accident, crime, or natural catastrophe." This is something people will avoid and do whatever necessary to prevent happening. The death of a one year old at the hands of a gun wielding two year old is as inevitable as rain, after the two year old picks up the gun.