The grandfather said the first shot was loud and hit the pond directly in front of them. He claims he yelled that there were people down at the pond and then there was a second shot that killed the grandson.
From that, I would say the child and grandfather were directly downrange from the shooter. Worse yet, the two should have been seen and heard by the idiot doing the shooting.
The grandfather also said the bullet went into the back of the boy’s head and out his forehead. I don’t know as much about guns as others, but that doesn’t sound like it’s likely to be a ricochet. It sounds like a straight shot.