Tragedies like that are pretty tough on folks. When I was a small kid, there was an old woman that used to roam the neighborhood. She was looney, saw bugs that weren't there, spoke to folks that weren't there, etc... She'd just walk into your house and sit down next to you and stare off into space. My sisters would run and hide, but I'd stay right next to her. Why???? Because if you waited long enough, she would open her purse and hand you a home made popcorn ball or giant sized candy bar!
Anyhow, the poor old woman was walking in her yard, got her dress caught on something, and fell behind her husband's car as he was backing out. She passed away and the old man moved shortly after. I'd see him riding his bike to the cemetery every few days for years after that. He had flowers in the bike basket. Really sad. Even as a little kid, and well into my teens, I'd see that man and get choked up.
So, it is best to always know where your family members are, teach them well to stay away from the driveway and any power equipment, and find out where all of them are before moving cars/equipment in tight spaces. Also best to never hot dog a car or piece of equipment in your driveway, as you never know if a neighbor kid, meter reader, etc... may be there. Just practice safety each and every time you can.