My first child died suddenly and traumatically. It directly affected how i reacted to my other children being ill when they were little. Super paranoia, and convinced they would die if they had the slightest cold at night. I still have this feeling about my kids, my wife, and other family members, especially when i can't get in touch with them when supposed to. Near as i can tell it is a PTSD reaction for me and it is exacerbated when i am depressed or mixed.