I agree with Gary and Motogiro…. at least you and your Nan are alright, or will be. I'm so very sorry about what's going on down there.
I too am no stranger to fire. We had to evacuate our home several years ago, thankfully, we were ok.
Hang in there! Our thoughts and prayers are with you all in Australia!
Few days ago I drove next to the aftermath of a small village fire (the firefighters were almost leaving)- a few properties burnt down to the point where some stone walls with small piles of ash in between and some sizzling smoke was all that was left.
Uncontrolled fire really is nasty. But it does put things in perspective- everyone has a list of "needed" and "nice to have" but at the end of the day all of it is just crap waiting to burn in the next fire, or wash away in the next flood, or get crushed in the next earthquake or tornado, or simply get taken away in the next brake in.