THIS is why I am such a huge advocate of carrying at home, especially if you have little ones (under the age of reason say 8, 9, 10 YO depending on the child). Lock everything else up but have one on your person in a pocket holster or a passive retention holster. This will go a long way to avoid the above types of tragedies.
"With great power, there must also come great responsibility." - Stan Lee
"All that is necessary for evil to triumph is for good men to do nothing." - Edmund Burke