want my descendants to know. I want my descendants to remember.
May I suggest that you literally get an exercise boo, and just start writing down stories, Incidents, events from your past.
If possible date the story.
It doesn't have to be great literature, just in your words, your story, history as seen experienced by you.
My Grandmother was encouraged by my Father to do this and over a number of years she wrote out stories as she remembered them.
Reading it was great assessment told us about things she'd seen, experienced that she hadn't told us about in conversations.