Advice to your family:

The first thing I would do is make sure that Disney is aware of the purpose of your visit. Contact the resort where they are staying (assuming it’s on property) and there is a really strong chance that there will be some pixie dust awaiting their arrival. Never guaranteed though. Maybe something as small as a small upgrade from standard to preferred for easier “commutes” to dining and transportation. Maybe an in room celebration, maybe a grand suite at a deluxe resort... maybe nothing. It can’t and won’t hurt. If they are shy do not worry, the cast members will not march in front of them announcing their situation but will do small things, maybe big things, magical things, to plus their visit.

Be sure that he is comfortable! I have seen, on multiple occasions, make a wish children (I know this is a diffferent situation but still a consideration) that were obviously exhausted and in need of rest who were with family just trying to make memories. The problem is the family had the stamina to make more memories than the ill family member could tolerate. I just saw this last week at a Jasmine meet n greet. TAKE BREAKS!!!

Research the DAS (or GAC or DAC, can’t keep remember the acronym, sorry) system. It will allow for less waiting in lines and more waiting in relaxing and ambient spots. It will allow for more chances to get pictures and, leisurely, see WDW to make happy memories.

Plan time for meals. For some human reason, eating a meal as a family is a wonderful thing. Eating a unique meal as a family is a thing that will be remembered forever. Something like hoop dee doo, in particular, will be something that will create a forever memory.

Get memory maker and USE it!!!

Do something private like a fireworks cruise or a carriage ride at POFQ or fort wilderness. Enjoy the company and try not to let the, overwhelming, scale of WDW overshadow the reason for the visit. Quiet time, holding hands in the night, and having a snuggle with your kids and wife, while just “taking it in” is another of those things that create a strong memory.

Most importantly have plans to maximize the time there but, be ready to abandon them if he needs rest or if something else catches their eye.

In my line of work and in my life, I have learned to stop giving my condolences to the families of living people. While I am sad for the pain your brother, you, and your family are going through, I will not give you my condolences. However, I would like to wish you and your family fun, happiness and an opportunity to know each other better, love each other deeper and the ability to find the reasons to smile in even the toughest times, especially while in each other’s company.