Hi Al. I’m so sorry about your diagnosis, but we all look forward to hearing more from you and what sounds like a beautiful, close family. It was hard enough (as you learned, too, with your grown sons) breaking the news to our then 25-year old daughter, as she and I are extremely close. Conversations like these are so delicate, especially since your grands are at an age to mostly understand what you are conveying to them.
I have spoken with a couple of my pALS friend that were diagnosed at an early age and had to tell their children, and they shared some helpful advice for other parents. I’m sure others on here can help as well, and there are some very helpful online resources about talking with children when facing a terminal diagnosis.
I have no doubt you, your wife and sons have thought this through very thoroughly, and are tailoring your conversations to be either more or less detailed depending on your grandkids individual personalities.
In general, my pALS friends suggested 1j focusing on the living part, since none of us knows how our progression plays out; 2) let them know that this illness is not contagious (a concern for lots of children especially with what they know about Covid); 3j tell them that you will still be the same Grandpa even though they will eventually see some changes, because your illness will eventually make it harder to use your arms and legs, and they might start noticing that you don’t talk as fast or as clearly (if you currently have bulbar symptoms—if not you might want to hold off on that part for now); 4) that you will probably need to use a wheelchair someday, but not to be upset because it will help you get around better; and 5) be honest about the fact that while there are some medicines now that can help a little, there is nothing right now that a doctor can prescribe that will make you get better. You might want to let them know that there are a lot of scientists working on medicines that might one day be able to help.
And of course the biggie that will probably be asked. Will you die? There are so many ways to answer that, so I won’t even suggest how best to respond. Since it sounds like you and your family have strong faith, you might want to include that in this part of the discussion. I remember one pALS sharing her diagnosis to her three children, and when that question was asked, she started by saying “okay, who here thinks they are going to live forever?” I thought it was a nice intro into the discussion about death in general and the fact that death is natural and nothing to be afraid of.
My thoughts are with you and your family, Al, as you have these conversations, especially here at the holidays. All my best, Kevin