<human>: So, this actually happened over 10 years ago, and it happened to my little sister, not me, but it haunts even me, and I felt it needed to be here. 

My little sister fucked up about a dozen years ago when we were kids. She got in a huge fight with our father and stormed off to her room after screaming "I hate you and I never want to see you again!" She woke up early the next morning and felt guilty, so she went out to apologize to dad. When she walked into the living room, she found him lying on the floor, cold and unresponsive. He passed away in the night, of an aneurysm in his lungs while on his way to the kitchen. To this day it is something my sister never speaks of, but you can always see it in the sadness her eyes took on that day.

Give me the gist of the text in a nutshell
<bot>: You never know how long or short life may or may not be. Cherish every moment like it is the last one you will every get.