It is indeed so bittersweet...
I traveled with my mother to WDW when she had cancer. The end never felt too close, but I would still look at her, doing something with her grandchildren, and the tears would well up in my eyes. I hope the trip is filled with many good memories, but I know it will be difficult.
My mom died three weeks ago and we will be going to WDW this summer. It will be bittersweet again, without Grammi, as we remeber our times with her there.
I wish you and your family all the best...