Chris, I came back to the forum after a long break to see this news, I watched my sister deal with cancer until she couldn't beat it, it's going on two years now and she was the youngest of four children, I am the oldest son and had three younger sisters, she is seven years younger than I.
When she was diagnosed it was estimated she had three to nine months left, she managed to stretch that time to just under three years.
It's not easy and my respect for your attitude here on the forum is great, that I believe is big part of the quality of what you leave those around you with, live each day and do all that you can to get the most out it all.
Sometimes it's the little things but get as many of the big things done as you can, take lots of pictures and make memories.
You and your family will be in our thoughts.