We all knew that it was coming but it doesn't make it any easier on anyone.
No, it never does. I lost dad to cancer in 1998. He was sick for a while so I knew it was coming and I thought I was "prepared". I wasn't. When he was sick it got to where he was in so much pain and on so much morphine he didn't even look like himself anymore. As he passed you could see the pain leaving his face and returning to look like his own. I knew he was at peace then and I was thankful for it.
Sorry for you loss. May he rest in peace now as well.