You Are an Elder
Generally speaking, there is a universal respect in all cultures and throughout history for elders. Elders have seen more and done more. They are wise. Not always, but almost all the time. There is a crown in gray hairs that commands respect. Use it.
Stories
Your age has provided you with lots and lots of stories to tell. Grandchild love stories! They love hearing how one uncle used to keep a toothbrush in his glove box to brush his teeth on the long commute to work only to have his son tell his dad he has been using it to clean his soccer cleats for months.
Second Most Powerful Relationship
A child’s most powerful relationship is with their parents. Their second most powerful relationship is with their grandparents. That is a lot of power. Make the best use of that power when you are with them. They will read your letter because you are that important to them.
You Write Your Family History
Only you can write your family history. You were the one that lived it. You hold the pen that writes the family history. It is in your power to include and exclude. It is in your power to see the positive or negative. History is written by the victors. Writing your letter makes you a victor.