From the article:
The preliminary investigation suggests Ogg's younger brother was holding the gun when it unintentionally discharged, the sheriff's office said."One of the younger brothers of the victim picked up a firearm -- not knowing it was loaded -- and made a motion with it, a non-threatening motion," said Captain Bill Thompson with Lane County Sheriff's Office. "It didn't appear to be a horseplay incident, but for whatever reason, the gun discharged."
Steven Ogg was engaged to be married.
Both boys lived with their family on the property of the Emerald Empire Gun Club in Springfield, Oregon, and their family took care of the facility. The shooting took place in the house there.
Guns were an integral part of their life. Presumably both brothers were well-acquainted with the four rules of gun safety and comfortable with using and handling guns. And yet, the accident still happens. Clearly such training wasn't enough.
The article does not name the younger brother or his age, or specifics on what kind of gun or how it was stored prior to the shooting.
Every gun in the hands of a child must first go through the hands of an adult.