Betsie, I am so very sorry for your loss and the terrible situation you have had to witness over the last 19 days, thank goodness your Dad is now at peace and he has no more suffering , it's devastating to watch loved ones go this way and in my mind it's not right, we should be able to help with a peaceful passing.......for some reason I always thought death would be peaceful and calm until I saw my Dad die and also my cousin from breast cancer and I now know death doesn't always come easy.
It's hard to get the image out your head and yes I still have flashbacks but they are getting less and I remember now my wonderful Dad before alzheimers and I'm sure you will experience the same in time.
I hope your Mum is coping and any decline in her is slow.......it effects everyone differently as I'm sure you know so take it one day at a time, it's all you can do.
Stay strong, have been thinking of you as your situation was so similar to my own in Nov and I understand how tough it is, take care xx