I can think of lots of snark about "only ones"...

...but none of it would be really appropriate.

A man shot and killed his son.

In training, I was taught don't have the weapon so close while you sleep that you aren't awake before you can pick it up. That's part of making sure of your target. That's part of rule #2.

My prayers go to the father and his family.

Off-duty cop shoots, kills son after mistaking him for intruder