While I mourn terribly for the grandfather and parents you describe ... and would mourn terribly if such a tragedy ever claimed one of my own ... I have told you what I do to prevent it ... education and training ... and what I would do in that event ... take solace from my God.
What I am not willing to do is EVER give my kids or grandkids the idea that a firearm or ammunition can be safe. It is dangerous to concieve of any such notion. I never want them to go down that path because that path ultimately leads to the complete aborgation of firearms rights and to tyranny.
You may not believe so ... you may not think so ... you may not see it. That's fine ... in my opinion you should mix your study of "accidental" shootings (and I believe the percentages and the statistics are tainted and add many things which are not true accidents) with a little more study on tyranny and what our founders established and why with the 2nd amendment ... what their philosophy was. Whether you ever believe it or not will be your affair ... and, as I said, that is fine, it is your right.
But I believe that any path in that direction leads to a fate worse than death and I will not take a step that way.
As Patrick Henry said,
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery! Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!"